A Selden mechanic who killed a motorcyclist in a multivehicle crash after using heroin the night before was sentenced Wednesday to 3 to 9 years in prison, Suffolk prosecutors said.

Paul Porrini, 55, had pleaded guilty in April to the entire indictment, which charged him with second-degree manslaughter, two counts of first-degree vehicular manslaughter, driving while his ability was impaired by drugs and alcohol, and driving while intoxicated.

He has been jailed on a bail of $500,000 cash, $700,000 bond since his arrest Sept. 28.

Porrini was driving a 2007 Chevrolet Express van west on Veterans Memorial Highway when he ran the light at the Johnson Avenue intersection, on the border of Hauppauge and Ronkonkoma, and struck Christopher White's motorcycle and three other vehicles, Suffolk police said.

White, 44, a father of three from Medford, was killed. He was leaving Long Island MacArthur Airport after he and other motorcyclists escorted World War II veterans to a flight to Washington, D.C.

Porrini admitted to police that he used heroin the night before the accident; he had fresh "track marks" and appeared intoxicated at the scene, prosecutors said.

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Four other people were injured, police said. They were taken to Southside Hospital in Bay Shore and Brookhaven Memorial Hospital Medical Center in East Patchogue, where they were treated and released.

With Ellen Yan