"The son of former ABC News anchor Ted Koppel, who was found dead in a stranger's apartment after a day of bar-hopping, overdosed on a lethal combination of drugs and alcohol, the medical examiner's office said Friday. Andrew Koppel's May 31 death was ruled an accident. He died from acute intoxication due to the combined effects of alcohol; heroin; cocaine; diazepam, the generic form of Valium; and Levamisole, a drug used to cut other drugs, said Ellen Borakove, a spokeswoman for the city medical examiner's office. Police had said no criminality was suspected. The 40-year-old Koppel had been out most of May 30 drinking heavily with Russell Wimberly. Wimberly, who initially said they had met for the first time that day, said Friday they had known each other about a month. He would not comment further. Koppel was eventually taken up to an apartment to sleep it off, said Belinda Caban, who lives in the apartment and said she didn't know Koppel."