A former Darien resident, whose mother died after he allegedly beat her for reminding him to take his medications, had his assault charge upgraded to murder at state Superior Court in Stamford on Tuesday.

At a brief appearance, Timothy Anderson, 42, who now lives in Stamford, was scheduled to return to court May 6, when he will be arraigned on the newer charge.

No pleas have been made in the case. Anderson also has been charged with first- and third-degree assault, unlawful restraint and disorderly conduct. He is being held at the Bridgeport Correctional Center in lieu of $500,000 bond.

Anderson's bond was not increased after being charged with murder, indicating prosecutors and police have no concerns Anderson, who was unemployed at the time of his arrest, will be able to make bond.

The upgraded charge filed by Senior Assistant State's Attorney Richard Colangelo was based on police and autopsy reports concerning the death of 76-year-old Maryann Anderson, who brought up her four boys and one girl in a West Avenue home in Darien before moving the family to Stamford. Her death was ruled a homicide caused by blunt force trauma to the head, according to the state Chief Medical Examiner's Office.

Authorities say Anderson attacked his mother in the home they shared around 4:30 p.m. March 23 after she and her oldest son decided to confront Anderson about not taking his prescribed medications for psychological problems. The family told police he had begun acting strangely, spending time alone, pacing and yelling for no apparent reason.

After insisting he was taking his pills, police say Anderson became violent when his mother told him she found the medication in the trash earlier that day. He then grabbed her by the collar and repeatedly punched her in the face, police said.

After she was taken to Stamford Hospital, doctors found Maryann Anderson had bleeding on the brain, and a part of her skull was removed during emergency surgery to alleviate pressure. She later slipped into a coma and was put on a ventilator. She died after the family took her off the ventilator three days later.

jnickerson@scni.com; stamfordadvocate.com/policereports; blog.ctnews.com/Stamford411