Marvin Norwood (at left with attorney Victor Escobedo) and Louie Sanchez (right) are shown in a preliminary hearing in 2012. (AP Photo/Los Angeles Times, Irfan Khan, Pool, File)

Two men who were charged with severely beating San Francisco Giants fan Bryan Stow at Dodger Stadium on Opening Day 2011 have entered guilty pleas in a Los Angeles courtroom.

Marvin Norwood, 30, pleaded guilty to one courtof assault likely to produce great bodily injury and Louie Sanchez, 31, pleaded guilty to one coumt of mayhem. Stow, a paramedic in Northern California, suffered serious head trauma and will require care for the rest of his life from a permanent disability. He has a pending civil lawsuit against the Dodgers and former owner Frank McCourt.

The incident shocked fans and prompted increased security at stadiums as well as a national debate on fan behavior because Stow was attacked when he and three other paramedics, all Giants fans, were walking through the parking lot. The Los Angeles Times recounted the incident:

Witnesses at a preliminary hearing last year described boorish, drunken and profane behavior directed against Giants fans by Sanchez.

Stow said that he hoped they “code,” paramedic slang for having a heart attack, and then the man later identified as Sanchez shoved Stow. The paramedics took off to avoid a confrontation but a few minutes later, the two assailants accosted Stow and his friends.

Witnesses said Stow was  sucker-punched by the man in a Dodger jersey. Stow fell on the ground, fracturing his skull and receiving permanent brain damage. Once on the ground, Stow was kicked in the ribs and head.

Sanchez and Norwood are also charged in federal court with illegal gun possession, the result of a search of Norwood’s home when he was arrested July 21, 2011.

Stow, who turned 45 on Feb. 12, returned home in the spring of 2013 after spending two years in hospitals and rehabilitation centers. Last week, family members wrote on his website that they shaved his head recently, “and it was shocking to see the damage to his skull. Seeing him stare at the mirror was heartbreaking. Watching him touch the shunt that protrudes on the right side of his skull, the slightly sunken-in left side and all the deep scars, was heartbreaking.”