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Fred Klein, the longest-tenured Knicks season-ticket holder dating to 1959, died Saturday of coronavirus, his wife Terry told The Post.

Klein, who lived in Manhattan his entire life, was 85. He caught the coronavirus in a nursing home, though originally it was deemed just pneumonia, his wife said.

Long before there was Spike Lee, Klein was known to associates as the “Knicks SuperFan.”

Klein also was a former co-owner of the Carnegie Deli and grew close to Knicks legend and MSG Network analyst Walt Frazier, helping him launch his restaurant “Clyde’s Wine and Dine.”

Though he was too ill to use his tickets the past couple of seasons, Klein, who had Alzheimer’s, diligently watched every Knicks game on television until this season, his wife said.

In a statement, the Knicks said, “He was one of the most enthusiastic fans of the Knicks. We send our deepest condolences to his family. He will be missed.”

In prior interviews with The Post, Klein defended embattled owner James Dolan, feeling he got a bad rap and cared deeply about the longtime season-ticket holders.

Dolan also tested positive for coronavirus. There has been no update on Dolan’s condition since March 28, when he was reporting “little to no symptoms” and was self-isolating in the Hamptons.

The son of immigrants, Klein became an Army Ranger and later played baseball in Puerto Rico and in the Red Sox system. He became a restaurant broker in the 1960s, and went on to become a partner in the Carnegie and Stage delis, among others. The Post reported in 2014 Klein had missed just 43 Knicks games since 1959.

“When we first dated, we went to a Knicks game — the first basketball game in my life,’’ Terry told The Post. “It was 1975. If you’re married to him, you had to love basketball. He liked them [just] as much when they were bad.”

The Kleins were also close to Red Holzman and his wife after being familiar faces at the Garden.

“Freddie was a fixture at Knicks games, part of the very fabric of Madison Square Garden. Ear-to-ear smile, would tell one of his silly jokes before he’d even say hello,” said John Cirillo, Knicks PR man from 1984-97. “He was astute in his knowledge of the game and in Knicks history. Freddie endeared himself to the players, but especially the coaches. Red Holzman, Dick McGuire, Hubie Brown and Rick Pitino were regulars at the Carnegie Deli after the games back in the day.

“Freddie made everyone feel that they were the most important person in the room. He made the world a better place and is a New York icon, born and bred in our great city.”

Into the 1990s, Klein often sat with his longtime friend and fellow Knicks diehard Stan Asofsky at the baseline and they were prime-time hecklers to opposing teams. Klein and Asofsky were immortalized in the Knicks book, “Miracle on 33rd Street.’’

“Fred was one of the best husbands anyone could ever have,’’ Terry said Wednesday in a statement. “I used to say to people that had just gotten married, ‘If your husband is half as good as Fred, you will have a perfect life.’ ’’

Klein is survived by his wife, his son Robert, his grandson and daughter-in-law.