Boyce died at age 30 and was found dead on May 13. He was found alongside his girlfriend Natalie Adepoju, 27.
“We would like to express our sincere condolences to the friends and families of Mr. Boyce and Ms. Adepoju during this difficult time,” the coroner’s office said in a statement.
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Boyce, who is best known for playing Tyler Crowley in the first “Twilight” movie, was found when officials were called to a condominium east of the Las Vegas strip.
“Greg’s cousin woke up and noticed that Greg’s car was still at the house. He was worried because Greg was to be in La.