Law enforcement officials said Wednesday they have retrieved the gun they believe was used by the East Garden City office shooter, from the Hudson River upstate.

Sang Ho Kim, 63, of Queens, is suspected of using the gun to kill a worker at Savenergy Inc. and seriously wound the business' owner Sept. 25. Kim was found dead five days later, floating in the Hudson near the Bear Mountain Bridge. Police say he shot himself.

The state police, working with Nassau homicide detectives, found the handgun they think Kim used near the bank of Sandy Beach State Park in Cold Spring. It was located close to where Kim's sport utility vehicle was found the night of the shooting, the Putnam County Sheriff's Office said in a news release.

Ballistic tests will be conducted to determine whether it is the one Kim used.

Putnam County Sheriff Donald B. Smith said that recovering the weapon will ease the concerns of people who come to the park.

"Families who visit the park need no longer worry that this gun might be lying somewhere along the shore or just off a trail where a child might find it and pick it up," he said.

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Much of Garden City, from the Roosevelt Field mall to nearby schools, was locked down for hours during the intensive manhunt that followed the shooting and later expanded to upstate.

Nassau police have said that Kim, a vendor for Savenergy, an energy-efficient lighting company, walked into its offices and fatally shot employee Zachariah Yong Jae Shin, 25, of Whitestone, Queens, and seriously wounded the owner, John Hyung Choi, of Woodmere.

Police have not given a motive for the shooting, but a law enforcement source and Kim's relatives said he believed he had been cheated out of money by Savenergy.