diff --git a/app/Http/Controllers/Apis/Protected/Summit/OAuth2PresentationApiController.php b/app/Http/Controllers/Apis/Protected/Summit/OAuth2PresentationApiController.php
index 2eeb7dd5..8c5769b6 100644
--- a/app/Http/Controllers/Apis/Protected/Summit/OAuth2PresentationApiController.php
+++ b/app/Http/Controllers/Apis/Protected/Summit/OAuth2PresentationApiController.php
@@ -452,12 +452,18 @@ final class OAuth2PresentationApiController extends OAuth2ProtectedController
             return $this->error500($ex);
         }
     }
+
     /**
+     * @param $summit_id
      * @param $presentation_id
      * @return mixed
      */
-    public function deletePresentation($presentation_id){
+    public function deletePresentation($summit_id, $presentation_id){
         try {
+
+            $summit = SummitFinderStrategyFactory::build($this->summit_repository, $this->resource_server_context)->find($summit_id);
+            if (is_null($summit)) return $this->error404();
+
             $current_member_id = $this->resource_server_context->getCurrentUserExternalId();
             if (is_null($current_member_id))
                 return $this->error403();
@@ -467,7 +473,7 @@ final class OAuth2PresentationApiController extends OAuth2ProtectedController
             if(is_null($member))
                 return $this->error403();
 
-            $this->presentation_service->deletePresentation($member, $presentation_id);
+            $this->presentation_service->deletePresentation($summit, $member, $presentation_id);
 
             return $this->deleted();
 
diff --git a/app/Models/Foundation/Summit/Summit.php b/app/Models/Foundation/Summit/Summit.php
index a6479d8f..0016d0d2 100644
--- a/app/Models/Foundation/Summit/Summit.php
+++ b/app/Models/Foundation/Summit/Summit.php
@@ -674,10 +674,17 @@ class Summit extends SilverstripeBaseModel
      */
     public function addEvent(SummitEvent $event)
     {
+        if($this->events->contains($event)) return;
         $this->events->add($event);
         $event->setSummit($this);
     }
 
+    public function removeEvent(SummitEvent $event){
+        if(!$this->events->contains($event)) return;
+        $this->events->removeElement($event);
+        $event->clearSummit();
+    }
+
     /**
      * @return File
      */
diff --git a/app/Services/Model/IPresentationService.php b/app/Services/Model/IPresentationService.php
index be2bc059..0e39e48f 100644
--- a/app/Services/Model/IPresentationService.php
+++ b/app/Services/Model/IPresentationService.php
@@ -80,11 +80,12 @@ interface IPresentationService
     public function completePresentationSubmission(Summit $summit, $presentation_id, Member $member);
 
     /**
+     * @param Summit $summit
      * @param Member $member
      * @param int $presentation_id
      * @throws ValidationException
      * @throws EntityNotFoundException
      * @return void
      */
-    public function deletePresentation(Member $member, $presentation_id);
+    public function deletePresentation(Summit $summit, Member $member, $presentation_id);
 }
\ No newline at end of file
diff --git a/app/Services/Model/PresentationService.php b/app/Services/Model/PresentationService.php
index bdc832a7..5d877c43 100644
--- a/app/Services/Model/PresentationService.php
+++ b/app/Services/Model/PresentationService.php
@@ -493,21 +493,22 @@ final class PresentationService
     }
 
     /**
+     * @param Summit $summit
      * @param Member $member
      * @param int $presentation_id
      * @throws ValidationException
      * @throws EntityNotFoundException
      * @return void
      */
-    public function deletePresentation(Member $member, $presentation_id)
+    public function deletePresentation(Summit $summit, Member $member, $presentation_id)
     {
-        return $this->tx_service->transaction(function () use ($member, $presentation_id) {
+        return $this->tx_service->transaction(function () use ($summit, $member, $presentation_id) {
 
             $current_speaker = $this->speaker_repository->getByMember($member);
             if(is_null($current_speaker))
                 throw new EntityNotFoundException(sprintf("member %s does not has a speaker profile", $member->getId()));
 
-            $presentation = $this->presentation_repository->getById($presentation_id);
+            $presentation = $summit->getEvent($presentation_id);
             if(is_null($presentation))
                 throw new EntityNotFoundException(sprintf("presentation %s not found", $presentation_id));
 
@@ -520,7 +521,8 @@ final class PresentationService
                     $presentation_id
                 ));
 
-            $this->event_repository->delete($presentation);
+            $summit->removeEvent($presentation);
+
         });
     }
 
diff --git a/tests/OAuth2PresentationSubmissionTest.php b/tests/OAuth2PresentationSubmissionTest.php
index 29f42cb1..2dc0e472 100644
--- a/tests/OAuth2PresentationSubmissionTest.php
+++ b/tests/OAuth2PresentationSubmissionTest.php
@@ -30,16 +30,10 @@ class OAuth2PresentationSubmissionTest extends ProtectedApiTest
             'social_description'  => 'this is a social description',
             'level'  => 'N/A',
             'attendees_expected_learnt'  => 'super duper',
-            'type_id'  => 171,
+            'type_id'  => 182,
             'track_id'  => 262,
             'attending_media' => true,
             'links' => ['https://www.google.com'],
-            'extra_questions' => [
-                [
-                    'id' => 24,
-                    'value' => 'test',
-                ]
-            ],
             'tags' => ['Upstream Development']
         ];
 
@@ -66,4 +60,34 @@ class OAuth2PresentationSubmissionTest extends ProtectedApiTest
         $this->assertEquals($title, $presentation->title);
         return $presentation;
     }
+
+    /**
+     * @param int $summit_id
+     */
+    public function testDeletePresentation($summit_id = 25){
+        $new_presentation = $this->testSubmitPresentation($summit_id);
+        $params = [
+            'id' => $summit_id,
+            'presentation_id' => $new_presentation->id,
+        ];
+
+        $headers = [
+            "HTTP_Authorization" => " Bearer " . $this->access_token,
+            "CONTENT_TYPE"        => "application/json"
+        ];
+
+        $response = $this->action(
+            "DELETE",
+            "OAuth2PresentationApiController@deletePresentation",
+            $params,
+            [],
+            [],
+            [],
+            $headers,
+            ''
+        );
+
+        $content = $response->getContent();
+        $this->assertResponseStatus(204);
+    }
 }
\ No newline at end of file