Gregory Tyree Boyce and girlfriend Natalie Adepoju's died from drug use, it's been revealed three weeks after their deaths.
Boyce, 30, and Adepoju, 27, died from the effects of cocaine and fentanyl intoxication, a Clark County Coroner spokesperson confirmed to PEOPLE on Tuesday. Their deaths were ruled accidental.
The pair were found dead in Las Vegas, Nevada, on May 13, a Clark County Medical Examiner spokesperson confirmed to PEOPLE at the time.
Boyce was best known for his role as Tyler Crowley in the first Twilight movie. The actor left behind a 10-year-old daughter Alaya while Adepoju, who is originally from Los Angeles, California, is survived by her young son Egypt.