A federal Customs and Border Protection agent died by suicide in the Bronx early Wednesday when he turned a gun on himself in front of his girlfriend, sources said.

The 29-year-old agent suffered a self-inflicted gunshot wound to the head inside an apartment at Westchester Avenue and East 152nd Street in Melrose around 6:40 a.m., authorities and sources said.

The man’s girlfriend — also a CBP agent — witnessed the moment her beau took his own life, the sources said.

The NYPD descended on the scene after receiving a 911 call for help, cops said.

The agent, whose name has not been released, was pronounced dead at the scene by EMS workers.

If you are struggling with suicidal thoughts or are experiencing a mental health crisis and live in New York City, you can call 888-NYC-WELL for fre

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