diff --git a/lib/api/v3/work_packages/work_package_representer.rb b/lib/api/v3/work_packages/work_package_representer.rb
index baa934af41..d8b6e1764f 100644
--- a/lib/api/v3/work_packages/work_package_representer.rb
+++ b/lib/api/v3/work_packages/work_package_representer.rb
@@ -86,20 +86,6 @@ module API
         property :version_name,  getter: -> (*) { work_package.fixed_version.try(:name) }, render_nil: true
         property :project_id, getter: -> (*) { work_package.project.id }
         property :project_name, getter: -> (*) { work_package.project.try(:name) }
-        property :responsible_id, getter: -> (*) { work_package.responsible.try(:id) }, render_nil: true
-        property :responsible_name, getter: -> (*) { work_package.responsible.try(:name) }, render_nil: true
-        property :responsible_login, getter: -> (*) { work_package.responsible.try(:login) }, render_nil: true
-        property :responsible_mail, getter: -> (*) { work_package.responsible.try(:mail) }, render_nil: true
-        property :responsible_avatar, getter: -> (*) {  gravatar_image_url(work_package.responsible.try(:mail)) }, render_nil: true
-        property :assigned_to_id, as: :assigneeId, getter: -> (*) { work_package.assigned_to.try(:id) }, render_nil: true
-        property :assignee_name, getter: -> (*) { work_package.assigned_to.try(:name) }, render_nil: true
-        property :assignee_login, getter: -> (*) { work_package.assigned_to.try(:login) }, render_nil: true
-        property :assignee_mail, getter: -> (*) { work_package.assigned_to.try(:mail) }, render_nil: true
-        property :assignee_avatar, getter: -> (*) {  gravatar_image_url(work_package.assigned_to.try(:mail)) }, render_nil: true
-        property :author_name, getter: -> (*) { work_package.author.name }, render_nil: true
-        property :author_login, getter: -> (*) { work_package.author.login }, render_nil: true
-        property :author_mail, getter: -> (*) { work_package.author.mail }, render_nil: true
-        property :author_avatar, getter: -> (*) {  gravatar_image_url(work_package.author.try(:mail)) }, render_nil: true
         property :created_at, getter: -> (*) { work_package.created_at.utc.iso8601}, render_nil: true
         property :updated_at, getter: -> (*) { work_package.updated_at.utc.iso8601}, render_nil: true