Los Angeles ( CNN ) -- Los Angeles authorities said Friday that they had arrested three people for an attack this spring outside Dodgers Stadium , adding that the man they 'd arrested exactly two months ago and described as the `` primary aggressor '' was not responsible . Louie Sanchez , 29 , and Marvin Norwood , 30 , have been charged with mayhem and assault -- both felonies -- related to the March 31 beating of Bryan Stow , the Los Angeles County District Attorney 's Office said . Sanchez is also charged with two misdemeanor counts of battery stemming from another incident on the same day . Both men , who are from Rialto , are being held on $ 500,000 bail . They are expected to appear Monday for their arraignment in Los Angeles Superior Court . A woman was also taken into custody with the men , though she has not yet been charged . Los Angeles Police Chief Charlie Beck told reporters Friday that charges against the woman -- whom he called 31-year-old Dorene Sanchez -- are pending . Bryan Stow , the man they allegedly attacked , meanwhile remains hospitalized in a San Francisco hospital , recovering from extensive brain and other trauma . Police said the 42-year-old paramedic from Santa Cruz , a Giants fan , was attacked by two men in the parking lot of the Los Angeles Dodgers stadium after the opening game of the Dodgers and Giants seasons . Unprovoked , the men began to kick and punch Stow , yelling profanities about the Giants , before heading off in a car driven by a woman , police said . Stow 's mother , Ann Stow , said that her son was first hit from behind , at which point he fell and his head hit the concrete . `` It was just a brutal attack , '' she said . `` Whatever that guy hit my son with , Bryan was unconscious before he hit the ground , so he had no way to protect his head . '' Stow was placed in a medically induced coma following the incident . He underwent emergency surgery Monday morning at San Francisco General Hospital , precipitated by `` massive amounts of fluid building up that caused a 30-second seizure , '' his family said on their website . By Friday , though , the family said that Stow 's condition had improved and he appeared `` very alert '' -- able to open and close his eyes on command , move his right hand and mouth his last name to medical staff . He struggles to recover as investigators continued to wrestle with a case that 's drawn intense public attention . Beck said that police had interviewed more than 600 people and devoted thousands of hours trying to crack the case . They thought they 'd gotten their break May 22 . Los Angeles authorities announced then that they had arrested Giovanni Ramirez , 31 , because they believed he was the `` primary aggressor '' in the attack . Ramirez , a documented gang member associated with the Varrio Nuevo Estrada street gang in East Los Angeles , was then ordered jailed on $ 1 million bail . On June 20 , he was ordered to serve 10 months -- a term that can not be reduced -- for violating parole related to a 2005 conviction for possession of a firearm , California 's Department of Corrections and Rehabilitation said in a press release . He previously had been convicted in 1998 for robbery , court records show . But a second charge related to Stow 's assault was dropped `` without prejudice '' on that same date `` due to the lack of the evidence presented on that charge , '' the corrections department statement said . Beck said Friday that Ramirez was exonerated as a result of the continuing investigation , adding that police met a `` burden of proof '' required to arrest him , but not to proceed with a criminal case . He conceded that the backtracking may not help police credibility , but said it is `` just as important that we find out the innocent that we find the guilty . '' `` What this investigation speaks to is that we do the right thing , even when it 's the hard thing , '' Beck said . `` This is about the character of the police department ... even when it reflects badly on us . ''
NEW : The man initially arrested for the beating has been exonerated , but remains in jail . Two men have been arrested on mayhem and assault in the beating of Bryan Stow . A woman is also in custody and charges against her are pending , the police chief says . Stow is in a San Francisco hospital , recovering from extensive trauma from the attack .