Criminal Investigation into Matthew Perry's Death Uncovers Hollywood Drug Network

Authorities explore possible manslaughter charges as they delve into the circumstances surrounding Perry's fatal ketamine overdose.

The LAPD, DEA, and U.S. Postal Inspection Service are collaborating on the investigation.
Brooke Mueller, ex-wife of Charlie Sheen, has been questioned but not charged.
An unidentified B-list actress and other celebrities are also under scrutiny.
Perry's Hollywood Hills home remains on the market amid the ongoing investigation.
Perry's death highlights the dark side of Hollywood's drug culture.