A rookie off-duty NYPD officer once involved in an on-duty shooting died by suicide in his Staten Island home early Thursday, police said. 

The 22-year-old man — who was not immediately officially identified — suffered a self-inflicted gunshot wound to the head around 1:50 a.m. inside a home in the Woodrow neighborhood, authorities said.

A gun was discovered next to him. 

He was rushed to a local hospital, where he was pronounced dead. 

The young man – who was discovered by his retired sergeant father – was just appointed to the NYPD in October of 2021 and worked midnight shifts, police sources said. 

With just over a year on the job, he was one of the officers who shot domestic violence suspect Jermaine Hickson, 42, in Coney Island in November of 2022, cops said.

Hickson fired off multiple rounds at cops before he was shot dead in a scene captured on startling video footage.

The officer worked in the 60th Precinct, which covers Coney Island, Brighton Beach, West Brighton Beach, and Sea Gate, the sources said. 

If you are struggling with suicidal thoughts or are experiencing a mental health crisis and live in New York City, you can call 1-888-NYC-WELL for free and confidential crisis counseling. If you live outside the five boroughs, you can dial the 24/7 National Suicide Prevention hotline at 988 or go to SuicidePreventionLifeline.org.