'A veteran NYPD detective who was recently stripped of his gun due to personal problems committed suicide at his mother’s Queens home while off-duty on Monday, law enforcement sources said.

Second-grade Detective Paul Federico, 53, was found hanging in the house on 79th Street in Middle Village around 12:25 p.m., sources said.

He was pronounced dead at the scene but no note was found.

“His wife was in front screaming,” said neighborhood resident Mario Kustera, 53.

“She was saying, ‘Why did my husband do this?’”

The 29-year veteran was a 9/11 first responder who helped searched for human remains amid rubble brought to the Fresh Kills on Staten Island.

He’d lost a kidney to cancer within the past two years, sources said.

“He was very dedicated to the job and to the department and he’ll be sorely missed,” Detectives’ Endowment Association President Paul DiGiacomo said.

Federico was recently stripped of his gun and placed on restricted duty due to unspecified personal problems, sources said.