WATERBURY — The family of a popular New Milford music teacher who died by suicide at Waterbury Hospital last March has filed a wrongful death lawsuit against the hospital.

Waterbury Hospital failed to properly supervise James Filgate even though he had been diagnosed as being at risk for suicide, according to the lawsuit filed in state Superior Court in Waterbury.

The lawsuit does not state specific money damages it seeks against the hospital.

“Waterbury Hospital failed Jimmy and failed his family,” said the family’s lawyer, Kathleen Nastri, of the Bridgeport firm Koskoff, Koskoff and Bieder. “The hospital let him down at his greatest time of need.”

The hospital is owned by Prospect Medical Holdings of Los Angeles, a for-profit hospital chain.

“Waterbury Hospital takes patient safety very seriously and we are committed to continuing to work closely with our regulators, our physicians and our staff with the goal of providing the safest care possible to our patients. As a matter of policy, we do not comment on pending litigation,” said hospital spokeswoman Lauresha Xhihani.

Filgate, 65, grew up in Ridgefield and was the owner of Apple Studios in New Milford, where he taught music, specifically guitar. He portrayed George Harrison in the cast of Beatlemania and gave benefit concerts around the area.

He was found hanging by his belt in the bathroom of his room at Waterbury Hospital on March 28 just hours after he told a hospital social worker he intended to kill himself by hanging, according to the lawsuit.

Police said they learned of the incident two days later when the Office of the Chief Medical Examiner called to report it to them, according to the police report. The state Department of Public Health later conducted an investigation.

According to the lawsuit, on March 23, Filgate was transported to Waterbury Hospital based on family concerns about his mental health. He was initially confined to the hospital’s behavioral health department but on March 25, Filgate was transferred to a general medical floor at the hospital, the suit states. While a psychiatrist and social worker at the hospital questioned the move, they did not object, the suit states.

His belt was returned to him despite concerns that he was a suicide risk, the suit states.

“At approximately 9 p.m., Jimmy locked himself in the bathroom of his hospital room and hung himself,” according to the suit.