A Lakewood man accused of being a serial rapist pleaded guilty in court on Thursday to raping four women in Colorado.Marc O'Leary was charged in four sex assaults in Aurora, Golden, Lakewood and Westminster. The charges included sexual assault, burglary, aggravated robbery, assault, menacing with a deadly weapon and kidnapping.Under a plea bargain, he pleaded guilty to 28 of 39 counts. The other 11 counts were dismissed.Some of his victims were in the courtroom Thursday but they left through a side door without talking to reporters.The prosecutor told 7NEWS he consulted with all the victims, to make sure they agreed with the plea deal, before he met with the defense attorney. He called the plea deal a good outcome because the likely outcome of a trial wouldn't have been any different.O'Leary could face up to four life sentences. He will be sentenced on Dec. 9 at 8:30 a.m.O'Leary is also a suspect in two sex assaults in Washington state. He may have to fly to Washington to face those charges before December.O'Leary's parents were in court Thursday and left through a side door with a defense attorney. Please watch 7NEWS at 3 p.m. and 5 p.m. for updates on this developing story.