diff --git a/CHANGELOG b/CHANGELOG
index d9962aed9e..a4589cb8d3 100644
--- a/CHANGELOG
+++ b/CHANGELOG
@@ -1,3 +1,6 @@
+v 6.6.5
+  - Added option to remove issue assignee on project issue page and issue edit page (Jason Blanchard)
+
 v 6.6.4
   - Add missing html escape for highlighted code blocks in comments, issues
 
diff --git a/app/assets/javascripts/project_users_select.js.coffee b/app/assets/javascripts/project_users_select.js.coffee
index aa8b70d9b8..03fad41c49 100644
--- a/app/assets/javascripts/project_users_select.js.coffee
+++ b/app/assets/javascripts/project_users_select.js.coffee
@@ -10,6 +10,16 @@
         query: (query) ->
           Api.projectUsers project_id, query.term, (users) ->
             data = { results: users }
+
+            nullUser = {
+              name: 'Unassigned',
+              avatar: null,
+              username: 'none',
+              id: ''
+            }
+
+            data.results.unshift(nullUser)
+
             query.callback(data)
 
         initSelection: (element, callback) ->
@@ -35,8 +45,13 @@
     else
       avatar = gon.relative_url_root + "/assets/no_avatar.png"
 
+    if user.id == ''
+      avatarMarkup = ''
+    else
+      avatarMarkup = "<div class='user-image'><img class='avatar s24' src='#{avatar}'></div>"
+
     "<div class='user-result'>
-       <div class='user-image'><img class='avatar s24' src='#{avatar}'></div>
+       #{avatarMarkup}
        <div class='user-name'>#{user.name}</div>
        <div class='user-username'>#{user.username}</div>
      </div>"
diff --git a/app/assets/stylesheets/sections/merge_requests.scss b/app/assets/stylesheets/sections/merge_requests.scss
index 6e21bf0b0a..ab61fcf41a 100644
--- a/app/assets/stylesheets/sections/merge_requests.scss
+++ b/app/assets/stylesheets/sections/merge_requests.scss
@@ -89,3 +89,11 @@
 .merge-request-form-info {
   padding-top: 15px;
 }
+
+// hide mr close link for inline diff comment form
+.merge-request {
+  .file .close-mr-link,
+  .file .reopen-mr-link {
+    display: none;
+  }
+}
diff --git a/app/controllers/projects/merge_requests_controller.rb b/app/controllers/projects/merge_requests_controller.rb
index 2b410c5a61..fce5403937 100644
--- a/app/controllers/projects/merge_requests_controller.rb
+++ b/app/controllers/projects/merge_requests_controller.rb
@@ -131,7 +131,7 @@ class Projects::MergeRequestsController < Projects::ApplicationController
   def automerge
     return access_denied! unless allowed_to_merge?
 
-    if @merge_request.opened? && @merge_request.can_be_merged?
+    if @merge_request.open? && @merge_request.can_be_merged?
       @merge_request.should_remove_source_branch = params[:should_remove_source_branch]
       @merge_request.automerge!(current_user, params[:merge_commit_message])
       @status = true
@@ -226,7 +226,7 @@ class Projects::MergeRequestsController < Projects::ApplicationController
 
     @merge_request_diff = @merge_request.merge_request_diff
     @allowed_to_merge = allowed_to_merge?
-    @show_merge_controls = @merge_request.opened? && @commits.any? && @allowed_to_merge
+    @show_merge_controls = @merge_request.open? && @commits.any? && @allowed_to_merge
   end
 
   def allowed_to_merge?
diff --git a/app/models/concerns/issuable.rb b/app/models/concerns/issuable.rb
index bf2c2157d3..75989888bf 100644
--- a/app/models/concerns/issuable.rb
+++ b/app/models/concerns/issuable.rb
@@ -23,7 +23,8 @@ module Issuable
     scope :assigned, -> { where("assignee_id IS NOT NULL") }
     scope :unassigned, -> { where("assignee_id IS NULL") }
     scope :of_projects, ->(ids) { where(project_id: ids) }
-
+    scope :opened, -> { with_state(:opened, :reopened) }
+    scope :closed, -> { with_state(:closed) }
 
     delegate :name,
              :email,
diff --git a/app/models/issue.rb b/app/models/issue.rb
index 6580c5004a..a8dc6e5fd8 100644
--- a/app/models/issue.rb
+++ b/app/models/issue.rb
@@ -28,8 +28,6 @@ class Issue < ActiveRecord::Base
 
   scope :of_group, ->(group) { where(project_id: group.project_ids) }
   scope :of_user_team, ->(team) { where(project_id: team.project_ids, assignee_id: team.member_ids) }
-  scope :opened, -> { with_state(:opened, :reopened) }
-  scope :closed, -> { with_state(:closed) }
 
   attr_accessible :title, :assignee_id, :position, :description,
                   :milestone_id, :label_list, :author_id_of_changes,
@@ -50,9 +48,7 @@ class Issue < ActiveRecord::Base
     end
 
     state :opened
-
     state :reopened
-
     state :closed
   end
 
diff --git a/app/models/merge_request.rb b/app/models/merge_request.rb
index b596d7eb9c..4774cbcf3a 100644
--- a/app/models/merge_request.rb
+++ b/app/models/merge_request.rb
@@ -100,8 +100,6 @@ class MergeRequest < ActiveRecord::Base
 
   scope :of_group, ->(group) { where("source_project_id in (:group_project_ids) OR target_project_id in (:group_project_ids)", group_project_ids: group.project_ids) }
   scope :of_user_team, ->(team) { where("(source_project_id in (:team_project_ids) OR target_project_id in (:team_project_ids) AND assignee_id in (:team_member_ids))", team_project_ids: team.project_ids, team_member_ids: team.member_ids) }
-  scope :opened, -> { with_state(:opened) }
-  scope :closed, -> { with_state(:closed) }
   scope :merged, -> { with_state(:merged) }
   scope :by_branch, ->(branch_name) { where("(source_branch LIKE :branch) OR (target_branch LIKE :branch)", branch: branch_name) }
   scope :cared, ->(user) { where('assignee_id = :user OR author_id = :user', user: user.id) }
@@ -160,6 +158,10 @@ class MergeRequest < ActiveRecord::Base
     MergeRequests::AutoMergeService.new.execute(self, current_user, commit_message)
   end
 
+  def open?
+    opened? || reopened?
+  end
+
   def mr_and_commit_notes
     # Fetch comments only from last 100 commits
     commits_for_notes_limit = 100
diff --git a/app/observers/merge_request_observer.rb b/app/observers/merge_request_observer.rb
index ef31498e7d..f2e2d16c94 100644
--- a/app/observers/merge_request_observer.rb
+++ b/app/observers/merge_request_observer.rb
@@ -22,6 +22,8 @@ class MergeRequestObserver < ActivityObserver
     create_event(merge_request, Event::REOPENED)
     create_note(merge_request)
     execute_hooks(merge_request)
+    merge_request.reload_code
+    merge_request.mark_as_unchecked
   end
 
   def after_update(merge_request)
diff --git a/app/views/projects/merge_requests/_show.html.haml b/app/views/projects/merge_requests/_show.html.haml
index ec9249be00..1badd701db 100644
--- a/app/views/projects/merge_requests/_show.html.haml
+++ b/app/views/projects/merge_requests/_show.html.haml
@@ -2,7 +2,7 @@
   = render "projects/merge_requests/show/mr_title"
   = render "projects/merge_requests/show/how_to_merge"
   = render "projects/merge_requests/show/mr_box"
-  - if @merge_request.opened?
+  - if @merge_request.open?
     - if @merge_request.source_branch_exists? && @merge_request.target_branch_exists?
       = render "projects/merge_requests/show/mr_accept"
     - else
@@ -24,9 +24,10 @@
 
   - content_for :note_actions do
     - if can?(current_user, :modify_merge_request, @merge_request)
-      - unless @merge_request.closed?
-        = link_to 'Close', project_merge_request_path(@project, @merge_request, merge_request: {state_event: :close }), method: :put, class: "btn grouped btn-close", title: "Close merge request"
-
+      - unless @merge_request.closed? || @merge_request.merged?
+        = link_to 'Close', project_merge_request_path(@project, @merge_request, merge_request: {state_event: :close }), method: :put, class: "btn grouped btn-close close-mr-link", title: "Close merge request"
+      - if @merge_request.closed?
+        = link_to 'Reopen', project_merge_request_path(@project, @merge_request, merge_request: {state_event: :reopen }), method: :put, class: "btn grouped btn-reopen reopen-mr-link", title: "Close merge request"
 
   .notes.tab-content.voting_notes#notes{ class: (controller.action_name == 'show') ? "" : "hide" }
     = render "projects/notes/notes_with_form"
diff --git a/app/views/projects/merge_requests/show/_mr_box.html.haml b/app/views/projects/merge_requests/show/_mr_box.html.haml
index 803e00292b..d7067f6985 100644
--- a/app/views/projects/merge_requests/show/_mr_box.html.haml
+++ b/app/views/projects/merge_requests/show/_mr_box.html.haml
@@ -37,7 +37,7 @@
       %i.icon-ok
       Merged by #{link_to_member(@project, @merge_request.merge_event.author)}
       #{time_ago_with_tooltip(@merge_request.merge_event.created_at)}.
-- if !@closes_issues.empty? && @merge_request.opened?
+- if !@closes_issues.empty? && @merge_request.open?
   .alert.alert-info.alert-info
     %span
       %i.icon-ok
diff --git a/app/views/projects/merge_requests/show/_mr_title.html.haml b/app/views/projects/merge_requests/show/_mr_title.html.haml
index b27522e46a..e94b1315de 100644
--- a/app/views/projects/merge_requests/show/_mr_title.html.haml
+++ b/app/views/projects/merge_requests/show/_mr_title.html.haml
@@ -3,8 +3,8 @@
 
   %span.pull-right
     - if can?(current_user, :modify_merge_request, @merge_request)
-      - if @merge_request.opened?
-        .left.btn-group
+      - if @merge_request.open?
+        .btn-group.pull-left
           %a.btn.grouped.dropdown-toggle{ data: {toggle: :dropdown} }
             %i.icon-download-alt
             Download as
@@ -18,6 +18,8 @@
         = link_to edit_project_merge_request_path(@project, @merge_request), class: "btn grouped", id:"edit_merge_request" do
           %i.icon-edit
           Edit
+      - if @merge_request.closed?
+        = link_to 'Reopen', project_merge_request_path(@project, @merge_request, merge_request: {state_event: :reopen }), method: :put, class: "btn grouped btn-reopen reopen-mr-link", title: "Close merge request"
 
 .votes-holder.hidden-sm.hidden-xs
   #votes= render 'votes/votes_block', votable: @merge_request
diff --git a/features/project/merge_requests.feature b/features/project/merge_requests.feature
index 556b96338d..435c47a276 100644
--- a/features/project/merge_requests.feature
+++ b/features/project/merge_requests.feature
@@ -29,6 +29,13 @@ Feature: Project Merge Requests
     And I click link "Close"
     Then I should see closed merge request "Bug NS-04"
 
+  Scenario: I reopen merge request page
+    Given I click link "Bug NS-04"
+    And I click link "Close"
+    Then I should see closed merge request "Bug NS-04"
+    When I click link "Reopen"
+    Then I should see reopened merge request "Bug NS-04"
+
   Scenario: I submit new unassigned merge request
     Given I click link "New Merge Request"
     And I submit new merge request "Wiki Feature"
diff --git a/features/steps/project/project_merge_requests.rb b/features/steps/project/project_merge_requests.rb
index adf9e77e13..813e7439b2 100644
--- a/features/steps/project/project_merge_requests.rb
+++ b/features/steps/project/project_merge_requests.rb
@@ -170,6 +170,18 @@ class ProjectMergeRequests < Spinach::FeatureSteps
     end
   end
 
+  step 'I click link "Reopen"' do
+    within '.page-title' do
+      click_link "Reopen"
+    end
+  end
+
+  step 'I should see reopened merge request "Bug NS-04"' do
+    within '.state-label' do
+      page.should have_content "Open"
+    end
+  end
+
   def project
     @project ||= Project.find_by!(name: "Shop")
   end
diff --git a/spec/features/issues_spec.rb b/spec/features/issues_spec.rb
index ffe6d02d2f..b9dab7846b 100644
--- a/spec/features/issues_spec.rb
+++ b/spec/features/issues_spec.rb
@@ -43,6 +43,31 @@ describe "Issues" do
         page.should have_content project.name
       end
     end
+
+  end
+
+  describe "Editing issue assignee" do
+    let!(:issue) do
+      create(:issue,
+             author: @user,
+             assignee: @user,
+             project: project)
+    end
+
+    it 'allows user to select unasigned', :js => true do
+      visit edit_project_issue_path(project, issue)
+
+      page.should have_content "Assign to #{@user.name}"
+
+      page.first('#s2id_issue_assignee_id').click
+      sleep 2 # wait for ajax stuff to complete
+      page.first('.user-result').click
+
+      click_button "Save changes"
+
+      page.should have_content "Assignee: Select assignee"
+      issue.reload.assignee.should be_nil
+    end
   end
 
   describe "Filter issue" do
@@ -245,6 +270,28 @@ describe "Issues" do
         page.should have_content milestone.title
       end
     end
+
+    describe 'removing assignee' do
+      let(:user2) { create(:user) }
+
+      before :each do
+        issue.assignee = user2
+        issue.save
+      end
+
+      it 'allows user to remove assignee', :js => true do
+        visit project_issue_path(project, issue)
+        page.should have_content "Assignee: #{user2.name}"
+
+        page.first('#s2id_issue_assignee_id').click
+        sleep 2 # wait for ajax stuff to complete
+        page.first('.user-result').click
+
+        page.should have_content "Assignee: Unassigned"
+        sleep 2 # wait for ajax stuff to complete
+        issue.reload.assignee.should be_nil
+      end
+    end
   end
 
   def first_issue