Yeah, that's possible. I mean, it should be in the way I'm seeing it. Just depends really how you want this portrayed.
Really, you can just create an event which shows the sprite of the main character getting murdered or something by the killer.
And then set the player to control the whatever the "Powers of Possession" Possesses.
After that, it all comes down to events, and story by how you make it.
It all just comes down to how you want it done, which I don't know so I just gave you my way of going about it.
I'm sorry if it doesn't answer your question on "How".
To be honest, I actually have no idea how to state "How".
All I can tell you is, Yes, it can work and is possible.
