An NYPD officer fatally shot a 61-year-old man, who police said was an innocent bystander, and wounded a suspected illegal gun salesman during an undercover gun-buy gone wrong in Mount Vernon Friday afternoon, police said Saturday.

Felix Kumi, 61, of Mount Vernon, died of his wounds at 12:55 a.m. Saturday at Jacobi Medical Center in the Bronx, police said. Kumi, who had been standing behind the suspect as the officer fired, was struck twice in the torso, police said.

Kumi's daughter, Rachel Kumi, 25, said it was too soon to talk about her father's passing.

"It just happened," she told Newsday on Saturday.

Felix Kumi was a father of two who drove a bus for the Mount Vernon school district for the past 10 years, Rachel Kumi told The Journal News earlier in the day.

"We're doing the best we can for the type of situation this is," she said. "It's a travesty that this happened."

She added: "He was kind and loving and concerned; very generous. If you ever needed anything, my father would never say no."

The gun suspect, a 37-year-old man, was shot three times in the torso after he allegedly pointed what turned out to be a replica .45-caliber handgun toward the officer. He was taken to Jacobi, police said. Charges against him are pending.

Another gun suspect was later arrested after fleeing the scene, police said. Jeffrey Aristy, 28, of 1605 Nelson Ave., the Bronx, was charged with two counts of criminal sale of a firearm and four counts of criminal sale of a controlled substance.

The incident unfolded about 4 p.m. Friday when the undercover officer in the Firearms Investigation Unit got a call from Aristy about guns for sale, police said. The officer, whom police did not identify, met Aristy in the Bronx.

Aristy got into the officer's car and told him to drive to Mount Vernon, where they met a second man -- the unidentified 37-year-old -- who got into the backseat of the car and "pointed a gun at the officer's head while demanding money," police said in the news release.

The officer gave him his money, signaled to his backup team and got out of his car "in order to engage" the man who had just robbed him, police said.

"As the officer attempted to stop the suspect, the suspect pointed his gun towards the officer," police said.

The officer fired several times, striking the suspect three times in the torso, police said. Two rounds also struck Kumi. Police found the replica gun and the officer's gun-buy money on the 37-year-old, police said.