A creeping threat

Exploration Stage: Garden of Oblivion
From: Lawrence de Bertrand
Description: I think a cup of bergamot tea would help me unwind a bit. Oh, and I need to find my teddy bear...it's my good luck charm. It should be around here somewhere.
Completed: Who put a knife in my teddy bear! A note is attached. It reads...On the day Matilda was engaged, I killed her. It says that a ghost named B.M. is coming to take my life to avenge it.... This seems to be a warning!