She was 75.
The infamous New York City crime was detailed in the 2007 documentary Crazy Love.
Pugach, who hid behind dark glasses for the rest of her life, died Tuesday (Wednesday, NZ time) at the Long Island Jewish Hospital in Queens. The cause was heart failure, said her husband, Burton Pugach, who spent 14 years in prison for hiring the thugs to attack his then-girlfriend Linda Riss after she spurned him. He was married at the time, and the heinous attack became an instant tabloid sensation.
After his release, Pugach divorced his first wife and convinced Riss to marry him in 1974. He proposed to her on live television.
"This was a very fairy tale romance," a sobbing Pugach said early today (NZ time).
After the release of Crazy Love, Pugach praised filmmaker Dan Klores for revealing a story that for the first time "has colours — it was no longer black and white."
Two decades after his release from prison, Pugach was accused in another case with chilling similarities but acquitted of the charges in 1997. He had been accused of threatening and harassing another lover after she tried to end their five-year affair. That woman testified that he threatened to make it "1959 all over again."
He told the AP in an interview at the time: "Haven't you ever threatened to kill your husband? Did you mean it? Of course not. … This has been blown out of proportion like I've never seen."
Linda Pugach testified at that trial, describing her husband as a good man. Under cross-examination by Pugach, a disbarred lawyer who defended himself, she said couldn't have sex with him after undergoing heart surgery in 1990.
"He was a naughty little boy and he was caught," she said as she left the courtroom on his arm. She said he was an adulterer, not a criminal.
Pugach said his wife went into the hospital on December 26, 2012, two days before they had scheduled a trip to Florida to buy a property in Boca Raton.
"I don't know how I'm going to go on without her," he said.
Today he again denied that he was ever involved in the attack.
"If I had told anyone to throw lye at her, would she have married me? A monster does that," he said.
Linda Pugach was being laid to rest in a crypt in Paramus, New Jersey, today (NZ time).
"There's a place for me there. We'll be together," he said.