Matthew Perry's death investigation is nearing conclusion, with Charlie Sheen's ex-wife, Brooke Mueller, being questioned multiple times. Authorities attempted to contact Mueller at her sober living house with a search warrant, but she was not home. Mueller, who has hired lawyers, has been cooperative with law enforcement but remains tight-lipped about the situation. She denies any involvement in Perry's death. Authorities seized an iPhone and laptop from Mueller, as their relationship is still undetermined. Mueller and Perry had met in rehab and formed an unexpected friendship. The LAPD continues to actively investigate Perry's death, which was due to an apparent drowning in a hot tub. The DEA and U.S. Postal Inspection Service are working with the LAPD to determine the presence of ketamine in Perry's system. The autopsy revealed trace amounts of ketamine, along with other contributing factors to his death. Perry had undergone ketamine infusion therapy for depression and anxiety, with the last treatment occurring more than a week before his death.