A toxicology report revealed that Soundgarden frontman Chris Cornell had “several” prescription drugs in his system at the time of his death.

Obtained by CNN, the Wayne County, Michigan Medical Examiner noted that Cornell had a mix of Naloxone, Butalbital, Pseudophedrine and Lorazepam, commonly found in Ativan. Cornell’s wife previously mentioned that her final conversation with her husband mentioned he had taken an extra Ativan prior to his death.

Vicky Cornell released a statement following the toxicology report saying, “After so many years of sobriety, this moment of terrible judgement seems to have completely impaired and altered his state of mind. Something clearly went terribly wrong and my children and I are heartbroken and are devastated that this moment can never be taken back.”

According to the Daily Mail, a former medical examiner in Michigan who reviewed Cornell’s autopsy report said he is “not absolutely convinced” the famed singer committed suicide.

Dr. Werner Spitz, who worked on such high profile investigations like John F. Kennedy and Martin Luther King Jr., said he was interested in the positioning of Cornell’s body. “The way he was found means he was able to regulate the pressure on his neck,” Spitz said. “In theory, it could be an accident.”