A 59-year-old longtime Upper East Side doorman with hopes to soon retire was killed in a freak accident Thursday morning, when he slipped while shoveling snow, fell through a window — and had his throat slit by the glass, police and friends said.

Miguel Gonzalez, of Connecticut, was clearing the steps leading downward into the lobby of the East 93rd Street building near 1st Avenue at around 9:30 a.m. when he lost his footing and fell down seven steps, crashing through the glass window, cops said.

Emergency responders rushed Gonzalez, who suffered deep lacerations to his neck and face, to Metropolitan Hospital, but he could not be saved. He was pronounced dead at 10:27 a.m., sources said.

“It’s a very, very sad situation,” said NYPD Chief of Patrol Terence Monahan at a snow briefing Thursday with Mayor de Blasio. “A reminder to people to be very careful when shoveling.”

A woman who lives in the 6-story building caught the aftermath of the fall that left Gonzalez in a pool of blood.

“It was terrible,” the woman said, becoming too distraught to speak.

Miguel Modesta, 29, a building worker who works directly across the street and knows Gonzalez well, said he ran over to the scene when he saw ambulances arrive.

“He was a really nice guy. A good man. I just can’t believe it,” Modesta said of Gonzalez, a Bridgeport, resident, who is married with an adult child.

“I just saw him this morning,” Modesta said.

Another building worker from across the street, who would only identify himself as Wendell, 35, said he was shoveling snow alongside Modesta when first responders arrived.

“We were told that he fell…all the way down and through the glass,” said Wendell, who described Gonzalez as “a very nice guy.”

“He was a great guy. Always said good morning to everybody. He was always joking around. He was very jovial,” Wendell said. “Everybody in the neighborhood loved him. If he was going to the store he’d buy you a coffee. This is a big shock. And it’s so sad because he was close to retiring.”

Wendell said that Gonzalez often talked about retiring soon.

“He was always cracking jokes. He is always upbeat. This is a major tragedy for the whole neighborhood. We need more people like him,” he said.

Modesta added that Gonzalez was the type of guy to buy breakfast for other building workers on the block.

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