You can do the deactivation (or destruction) of the game object in the event using an Activate Object or Destroy Object node.
The player respawning would have to be called somewhere, so unless your event does that it would have to be some external factor that's triggered by the event ... hard to tell without knowing the details of your event (and general setup).
Hm, are you using the new UI and somehow also using the player's prefab as a UI prefab?