Details on Adam Rich's final moments have come to light.

The Eight Is Enough actor died in January at age 54 due to an accidental fentanyl overdose, according to the L.A. County Medical Examiner's autopsy report.

While his cause of death was attributed to the opioid, Rich also had non-toxic amounts of alcohol and lorazepam—a drug that treats anxiety—in his system at the time, per the report.

Law enforcement sources told TMZ in January that his body was discovered in his Los Angeles-area home.

Rich's rep Danny Deraney confirmed his cause of death, adding that the lorazepam was prescribed by his doctor and the star had not been using drugs "for quite some time."

"If there is any silver lining, it's that our suspicions were correct that it was an accidental overdose from fentanyl and not recreational drugs," Deraney told news outlets. "We hope this closes the chapter on any suspicions people had and now the family can have some privacy as we move forward."

Rich was born in Brooklyn, New York, and landed his first role in a 1976 episode of The Six Million Dollar Man when he was about 8 years old. The next year, he debuted on Eight Is Enough, playing his most well-known part—as youngest son Nicholas Bradford, who popularized the "pageboy" haircut—on the ABC show until its end in 1981.