'Ketamine Queen' and cover-ups: Five things discovered in the Matthew Perry probe

When Friends actor Matthew Perry was found dead in a hot tub at his Los Angeles home last year, it seemed like it could have just been an accident.

He'd been treating his depression with ketamine infusion therapy, wasn't found with drug paraphernalia or anything suggesting foul play, and appeared to have drowned.

He'd spent decades fighting addiction, but the actor had said he was finally clean. read more