He faces up to six years in state prison when he is sentenced on March 30.
The one time onscreen superhero admitted to the manslaughter of a roommate using a sword.
The two had argued over Medina's girlfriend.
Medina and Sutter got into an argument that escalated into a fight in a house that they shared in Green Valley. But after thorough investigation, the prosecutors filed murder charges against him on January 14, 2016.
The incident occurred in January 2015 and allegedly started with an argument between Medina and Sutter over how Medina's girlfriend had parked her auto.
The altercation between Medina and Josh Sutter, his roommate at the time, occurred on January 31, 2015.
So Medina was released soon after the court hearing and while addressing the media he said, "I'm very, very, very sorry for what occurred".
Through probably not the kind of press it wishes to have, the highly-anticipated Power Rangers film will be released in theaters later this month.
Power Rangers Samurai, which was on screens from 2011 to 2012, was his last listed acting job. "Mr. Medina then picked up the closest weapon, which was the sword". "Josh don't have that in his heart to attack anybody", he said.
Outside of the franchise, the 38-year-old appeared in ER and CSI: Miami. Had he been convicted of murder, Medina would have faced 26 years to life in jail.
But he also starred as the Red Ranger in "Power Rangers Wild Force".