Martial artist Darren Shahlavi, who has appeared in Mortal Kombat: Legacy and the CW series Arrow, has died. He was 42.

His agent tells Variety that Shahlavi died in his sleep on Jan. 14. A cause of death was not revealed, but a law enforcement source reportedly told TMZ that the actor died of an apparent overdose on prescription medication.

"Don't know how to express the emotions I'm feeling right now. Last night I found out my dearest brother had past away, he was a true inspiration to so many people including myself and I will forever be proud of all of your accomplishments with your acting career," his younger sister, Malouse, posted on Twitter.

"I can not begin to explain how much you will be missed by me and our family. You were an amazing person with endless talent. You will be forever loved by so many x."