July 4, 2024 – The investigation now includes the LAPD, the US Drug Enforcement Administration and the US Postal Inspection Service. Through the investigation, officials are hoping to find out who gave the beloved actor the lethal dose of ketamine. A second celebrity, an anonymous woman, has been linked to his death, according to InTouch. A source told the outlet that this woman and Matthew appeared to be sober to those around them but were “walking pharmacies.”

The source claims the two had various late night talks about their lives and struggles with addictions. There’s also an alleged photo of the two at the office of a doctor who prescribes ketamine.

InTouch reports: “The source believes Matthew and the second celebrity pal may have ‘aided’ each other by referring each other to their respective doctors whenever their own drug supply ran low.”