I think my friend admitted to a murder

While getting drunk and doing coke with someone I consider a close friend, almost like a sister, she admitted to her and her friends robbing men while having sex with them. The last time they did it involved a man in his late 60s. She said they grabbed his phone while he was in kinky handcuffs and tried to force him to reveal his passcode to record him for blackmail. She explained that every time he said no, they pushed in larger and larger objects, until he started to convulse. She added that they panicked and left once that happened. She doesn't know what happened to the man after that and then changed the subject. It's left me really unsettled, but I was too drunk and coked up to really make a good decision and leave. So I ignored everything and passed it off.