Two Long Island men died Friday night in separate accidents in which each lost control of his motorcycle.

Darien Grasman, 26, of Bay Shore, was riding east on Mill Road in Calverton, west of Edwards Avenue, when he lost control, skidded off the roadway and struck a tree about 7:45 p.m., Suffolk County police said.

Grasman was pronounced dead at Stony Brook University Hospital, Suffolk police said. Seventh Squad detectives are investigating.

About four hours later, Adelso Espinal, 32, of Freeport, was traveling west on the Grand Central Parkway approaching 166th Street in Queens when he struck a bump in the left lane and fell from his bike, sliding a distance before stopping in the middle lane.

A 71-year-old man driving a 2014 Honda CR-V in the middle lane on Grand Central attempted to swerve to avoid Espinal but was unable to, the NYPD said. The driver, whose name was not released, was not hurt, police said.

There were no arrests and the investigation is ongoing, police said.

Espinal was pronounced dead at Jamaica Hospital, police said. Attempts to reach his family Saturday were not immediately successful.

Grasman's uncle, Scott Grasman, 56, of Elmont, described Grasman as "a shining star to this family."

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"He was just a very outgoing, fun-to-be-with kid. Not a care in the world. He loved life," Scott Grasman said. "The thing that killed him was his best hobby. If he wasn't on the track with the bike, he would be on the street with the bike."

Grasman said his nephew was the oldest of three, with two younger sisters, and a graduate of Seaford High School. Darien Grasman was an iron worker and had worked on One World Trade Center.

"He was doing really well with the iron workers union," said Grasman, adding that his nephew also worked on cars and was an excellent welder. "I can't believe he's gone . . . He was wearing all the right stuff. It was just one of those things. He was just going too fast."

According to the National Highway Traffic Safety Administration, 4,957 motorcyclists were killed in traffic crashes nationwide in 2012 -- a 7 percent increase from 2011. There were 164 fatal motorcycle crashes in New York in 2012, state Department of Motor Vehicle statistics show.