NYPD detectives asked for the public's help Wednesday in finding whoever shot and killed a 16-year-old Queens boy just blocks from where his brother met the same fate a bit more than three years ago.

Chief of Detectives Robert Boyce described the Sunday night shooting death of Neshawn Plummer, 16, in the Wavecrest section of Queens as a "heartbreaking story."

It's unknown whether police ever caught a suspect in the July 2012 shooting death of the teen's older brother, Shawn.

Boyce said Neshawn Plummer was shot in the head just before 9 p.m. as he stood on Seagirt Boulevard. He later died at Long Island Jewish Medical Center, Boyce said.

On July 12, 2012, Shawn Plummer, 18, was gunned down two blocks west near the intersection of Beach 29 Street and Seagirt Boulevard. He was also taken to Long Island Jewish Medical Center, where he was pronounced dead, according to a news account at the time.

In the latest shooting, investigators believe at least two men were arguing with an acquaintance -- not Neshawn Plummer -- when shots were fired, Boyce said. It was not known Wednesday whether Neshawn Plummer knew the others.

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During a briefing with reporters Wednesday, Boyce played a short video showing two men believed to have been involved in the shooting running past a car with an open passenger door.

Police ask anyone with information to call Crime Stoppers at 800-577-TIPS (8477). Tips can also be submitted on the Crime Stoppers website at WWW. NYPDCRIMESTOPERS.COM or by texting 274637 (CRIMES) then enter TIP 577.