Nassau County police were investigating a man’s suicide at his Oceanside apartment Saturday evening as a SWAT team was serving a warrant.

Officers were serving a bench warrant for a Long Beach drug offense, police said. The unidentified man, 30, was also wanted on a parole violation for a violent felony.

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Police swarmed an attached apartment at the home at 3515 Oceanside Rd. at about 2 p.m. and saw the tenant holding a gun. The man ran to another room where he was found dead from a self-inflicted gunshot wound, detectives said.

Police said officers did not fire their weapons during the incident. Further details about the warrants were not immediately available.

“It’s a little shocking,” said Avi Wald, whose family lives nearby. “We picked this house because it’s a nice quiet neighborhood.”

He said the man wanted by police had rented the apartment for about a year and didn’t act suspiciously.

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“He seemed to me like a nice guy. Now he’s dead,” Wald said.