Former Brooklyn City Councilman and longtime Democratic operative Lew Fidler died Sunday, two days after he was found unconscious in a Queens movie theater, sources told The Post.

Fidler, who underwent a double kidney transplant in 2014, was discovered inside the theater at around 11:30 p.m. Friday, police sources said. He was taken to Elmhurst Hospital, where he died around 12:30 p.m. Sunday without ever regaining consciousness, sources said.

Police sources said they do not suspect foul play.

“He was a truly remarkable man and a remarkable dad,” his widow, Robin Fidler, told The Post.

“He made me happy when things were sad. He made me feel beautiful on days I felt just . . . ugly. He made me feel thin on days on days when I gained a little too much weight. Just everything you would expect or want for yourself.”

Fidler, who served on the City Council from 2002 to 2013, was supposed to be on his way up to the Catskills to meet Robin at their summer home in Monticello, the grieving widow said.

“On Wednesday morning, I went upstate,” she said. “He was going to come up early Friday.”

In the aughts, Fidler famously fought to restore funding for homeless LGBT youth that was routinely cut under then-mayor Mike Bloomberg, even though gay rights was not a burning issue in his moderate Brooklyn district.

“There are literally thousands, if not tens of thousands, of runaway/homeless youth in NYC whose lives have been hugely changed because of Lew Fidler,” City Council Speaker Corey Johnson tweeted Sunday.

“He was their champion, their pitbull, their hero,” Johnson wrote. “Lew: you saved MANY lives. Especially LGBT youth. Thank you. RIP my friend.”

One of Fidler’s former council colleagues, David Greenfield, told The Post, “He was a real mensch.

“He was always a man of principle who was well respected and admired.”

Fidler most recently worked in the office of Brooklyn Borough President Eric Adams, who called the late councilman a “vital member of my team” in a statement Sunday.

“Lew will be missed, but never forgotten,” Adams wrote.

Mayor de Blasio, who served alongside Fidler in the City Council, remembered him in a Sunday tweet as “a champion and protector to runaway youth and some of the most vulnerable kids in our city.”

A medical examiner will determine Fidler’s cause of death, authorities said.

Additional reporting by Craig McCarthy and Carl Campanile