Cops are asking New Yorkers to help track down the shooter who killed a Queens rapper in May — and they're offering a hefty reward.

The New York Police Department announced a $2,500 reward for any information on the shooting dead of Lionel Pickens — otherwise known as Chinx.

RELATED: Queens rapper Chinx killed in shooting

Pickens, 31, was gunned down on May 17 as he and a passenger were in the musician's silver Porsche driving west on Queens Boulevard in the early morning.

The unidentified shooter fired multiple times before before speeding off.

RELATED: Five arrested during filming of video tribute to rapper Chinx

Both men were rushed to an area hospital but only the passenger, Antar Alziadi, survived.

Chinx's debut album, "Welcome to JFK" became available for streaming on music magazine Billboard's website on Monday, days before its Friday release.