diff --git a/admin/app/admin/onboarding.rb b/admin/app/admin/onboarding.rb
index 33eb7420e..8e4358691 100644
--- a/admin/app/admin/onboarding.rb
+++ b/admin/app/admin/onboarding.rb
@@ -96,6 +96,9 @@ ActiveAdmin.register JamRuby::User, :as => 'OnboarderManagement' do
         if user.is_waiting_onboarding || user.is_onboarding
           link_to("mark onboarded", mark_onboarded_admin_onboarder_management_path(user.id), {  'data-confirm': "Mark onboarded?"})
         end
+        if user.is_waiting_onboarding || user.is_onboarding
+          link_to("mark lost", mark_lost_admin_onboarder_management_path(user.id), {  'data-confirm': "Mark lost (reason = Other)?"})
+        end
       end
     end
     column "Onboarder Notes", :onboarding_onboarder_notes
@@ -127,4 +130,9 @@ ActiveAdmin.register JamRuby::User, :as => 'OnboarderManagement' do
     redirect_to :back
   end
 
+  member_action :mark_lost, :method => :get do
+    resource.mark_lost
+    redirect_to :back
+  end
+
 end
\ No newline at end of file
diff --git a/ruby/lib/jam_ruby/models/user.rb b/ruby/lib/jam_ruby/models/user.rb
index 535eaae81..4130caa43 100644
--- a/ruby/lib/jam_ruby/models/user.rb
+++ b/ruby/lib/jam_ruby/models/user.rb
@@ -353,7 +353,7 @@ module JamRuby
     end
 
     def is_onboarding
-      ONBOARDING_STATUS_ASSIGNED || ONBOARDING_STATUS_ESCALATED || ONBOARDING_STATUS_EMAILED || ONBOARDING_STATUS_LOST
+      ONBOARDING_STATUS_ASSIGNED || ONBOARDING_STATUS_ESCALATED || ONBOARDING_STATUS_EMAILED
     end
 
     def user_progression_fields
@@ -2543,6 +2543,12 @@ module JamRuby
       self.save!
     end
 
+    def mark_lost(lost_reason = LOST_REASON_OTHER)
+      self.onboarding_lost_at = Time.now
+      self.onboarding_lost_reason = lost_reason
+      self.save!
+    end
+
     def has_booked_with_student?(student, since_at = nil)
       LessonBooking.engaged_bookings(student, self, since_at).count > 0
     end