A Death that is not explained

[Eman Resu]

After discussing with a friend also, I decided to keep time travel for later in the campaign, since we are at 3rd level.
I made the murder seem like a ghost story, based on an old myth. Of course someone exploits the ghost myth, for
his purposes

YIIPES! YOU SCOOBY DOO'D EM.

 

[Herobizkit]

This episode (s5e18) of Star Trek:TNG deals with this issue exactly, including Data (the "warforged") being the key to solving the causal time loop.