According to reports, the note he left gave details of the murder scene that had never been made public. There is also a lot of forensic evidence (DNA, ballistics, fingerprints) that will easily confirm whether he is the killer. If he is, I'm glad he offed himself.
If the perp setup this guy to take the fall, it would be easy to create a suicide letter with the details of the murder. After all this guy is dead...
I hope there is other hard evidence to confirm his guilt.
Hoping this is truly the murderer.