He was found unresponsive on the bathroom floor of a friend's house in Los Angeles in September with reports at the time suggesting paramedics suspected cardiac arrest caused the 59-year-old's sudden death. TMZ has now broken the story that fentanyl was to blame with the news site quoting the rappers long time manager Jarez Posey as stating Coolio's family recently received the news from the coroner. Traces of heroin and methamphetamines were also found in his system. Posey added that investigators determined the Gangsta's Paradise hitmaker's severe asthma and decades-long use of cigarettes…