Can't Buy Me Love star Amanda Peterson, who passed away on July 5, died from acute morphine toxicity, the Weld County Coroner's Office in Colorado has confirmed.

Peterson was found dead inside her Greeley, Colorado home last month, and the cause of death is being labeled as an accidental drug overdose. Peterson, who was 43 at the time of her death, reportedly ingested a deadly cocktail of prescription drugs, including benzodizepines, opiates and phenothiazines. Marijuana was also found in her system and the coroner's report stated the starlet died of a "morphine effect," which apparently triggers respiratory failure.

Though the actress was arrested in May 2012 for DUI and possession of narcotic equipment, her mother Sylvia Peterson previously told Entertainment Tonight she was confident her daughter's death was NOT related to substance abuse. "This was not, in any way, a drug thing," she told the show. "She was in bed, and she'd had a wonderful day, and we were planning on a dinner the next day. So it was just a very, very big surprise."

So sad!