Nearly one year after he was found dead, the cause of death for Justin Bieber lookalike Toby Sheldon has been revealed. Sheldon aka Tobias Strebel was known for spending $100,000 on plastic surgery to look like Bieber. According to the autopsy report, he passed away from a drug overdose. The 35-year-old had Valium, Xanax, the sleep aid Temazepam, and alcohol in his system at the time of his death.