“James Terry was hired by the Mann family after Beau’s disappearance and said he believes some of the facts in his possession make for a compelling narrative, even if it lacks a final act.
Terry doesn’t call it a "theory" as there are holes in his knowledge but he does say he can connect several dots in the case. He says Mann was on drugs, probably suffered a drug overdose and died in the home of a friend who was also a known drug addict.
According to Terry, Mann’s lifestyle was at best an open secret and more realistically, just something people knew even if they didn’t talk about it.
He said Mann had continued to use drugs despite claims that he had kicked the habit. Terry said there is evidence that a known drug-dealer visited Mann’s home in the days before he went missing and that Mann’s behavior on the day he disappeared is indicative of his habits while using drugs.”
https://smdp.com/news/beau-mann-case-becomes-the-subject-of-international-speculation/