Answer
Layne Staley's death was caused by a speedball overdose, a lethal combination of heroin and cocaine. Staley, the lead singer of the rock band Alice in Chains, had struggled with substance abuse for many years. On April 5, 2002, he was found unresponsive in his Seattle apartment and was pronounced dead at the scene. The autopsy report revealed that he had died from a combination of heroin and cocaine toxicity.