More in Whitney Houston: Death of a pop diva “The family is making arrangements,” Assistant Chief Coroner Ed Winter said Monday. “I don’t know when the family is going to have her body picked up. But they are making arrangements and sometimes it takes a couple days.” An autopsy on the singer was completed Sunday; however the coroner is not officially saying what killed the six-time Grammy winner. Beverly Hills Police Lt. Mark Rosen said that his agency may release more details Monday about Houston’s death, but it will depend on whether detectives feel comfortable releasing any information. Law enforcement sources told CBS News that while there were no illegal substances found in Houston’s hotel room, there were prescription drugs. Authorities said the most likely theories for Houston’s death are that she died of a heart attack or a prescription drug overdose, but no official determination has been made, CBS News correspondent John Blackstone reports. Complete Coverage: Pop diva Whitney Houston dead at 48Whitney Houston in recent interview: “I’m good”Whitney Houston death may be mystery for weeks