MIAMI, Fla. - A South Florida teen died of a lethal drug overdose in front of a live online webcam audience 12 hours after he started blogging about his plan to commit suicide, an investigator said Friday.

Abraham Biggs, 19, died Wednesday from a toxic combination of opiates and benzodiazepine, a drug used to treat insomnia and depression, said Wendy Crane, an investigator with the Broward County medical examiner’s office. At least one of the drugs was prescribed to him and it’s unclear how he got the others, Crane said.