Prosecutors say the ex-Power Rangers star stabbed Joshua Sutter several times in the stomach in 2015 at their house in Green Valley, a mountain town north of Los Angeles.
It is claimed Ricardo Medina and Joshua Sutter were arguing over Medina’s girlfriend.
The 37-year-old actor could face 26 years to life in prison if convicted.
Authorities say after the attack, Ricardo Medina called emergency services and waited for police to arrive.
Speaking three days after the attack on January 31, 2015, Ricardo Medina said he was “very sorry”.
Ricardo Medina, who played the Red Ranger on Power Rangers Wild Force in 2002, said he and a female friend locked themselves in his bedroom after a row with Joshua Sutter.
He claimed Joshua Sutter kicked the door open, at which point he grabbed the sword to protect himself.
Ricardo Medina, who was initially arrested after calling 911, denies murder.
Ricardo Medina was also the voice of Deker on Power Rangers Samurai in 2011 and 2012.
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