LOS ANGELES (REUTERS) - An actor best known for his role in a Power Rangers children's television series who prosecutors said stabbed his roommate to death with a sword during an argument pleaded guilty on Thursday to manslaughter.

Richard Medina, 38, entered the plea during a hearing in Los Angeles Superior Court. He faces up to six years in state prison when he is sentenced on March 30.

Prosecutors said Medina stabbed Josh Sutter with a sword multiple times on Jan 31, 2015, as the two men argued about the actor's girlfriend at their apartment in Palmdale, north of Los Angeles.

According to an account provided by the Los Angeles County Sheriff's department following the incident, Medina retreated to his bedroom with his girlfriend during the argument and when Sutter forced open the door, Medina stabbed him in the stomach.

Following the fatal confrontation, Medina called the 911 emergency number and remained at the scene until sheriff's deputies arrived. Sutter died of his injuries.

Medina was arrested at the time of Sutter's death but was released within days after prosecutors asked for further investigation into the high-profile case.

He played the Red Lion Wild Force Ranger on the popular Power Rangers Wild Force (2002) children's television series.

He also voiced the character of Deker on a later series, Power Rangers Samurai (2011-2012), which, like Power Rangers Wild Force, was a rebranded version the 1990s series Mighty Morphin Power Rangers, and appeared on such prime-time shows as CSI: Miami (2002-2012) and ER (1994-2009).