He spent time in prison for murdering his mother in 1989.Now police say a 38-year old man from Waterville is accused of trying to attack a woman in a clothing store changing room. Scott Thompson is charged with attempted gross sexual assault. Police say he entered Maurice’s women’s clothing store at about 8 o’clock Friday night and burst into one of the changing rooms.Thompson reportedly shoved a woman against the wall, but she resisted and called for help. Thompson took off and was arrested a short distance away.Thompson was convicted of murder in 1991 for the stabbing deathof his mother, Edith Thompson, in her mobile home in East Winthrop. He was arrested last summer for breaking into an adult novelty storesoon after being released from prison on the murder conviction.