A suspect has been arrested for the caught-on-video shooting death of a man sitting on a chair enjoying a Brooklyn block party — one of a half-dozen shootings over a six-hour stretch in the city this past weekend.

Tony Caba is accused of killing 45-year-old Roberto Cuevas in front of shocked partygoers near Fourth Ave. and 57th St. in Sunset Park.

The group had gathered to celebrate a neighbor’s 78th birthday, a witness told the Daily News. Cuevas was sitting in a plastic chair on the sidewalk when the shooter walked up to him, whipped out a gun without warning and fired five times at close range about 9:10 p.m. Saturday.

Medics rushed Cuevas to NYU Langone Hospital-Brooklyn, where he died from a gunshot wound to the back.

Cops say Caba, 39, lives in Kissimmee, Fla. He is charged w

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