REVEALED: Patrick Swayze DIED Battered — Two-Timing Wife Left Him Lying In Filth Exclusive: 'She would beat on him…it was abusive,' claims close friend of late star.

In his tragic last days, wasting away from savage pancreatic cancer, Patrick Swayze was imprisoned in a house of horrors – deserted by his cheating, abusive wife, who left the dying star to wallow in his own filth!

That’s the shocking charge by one of the “Dirty Dancing” icon’s closest friends, who rips the lid off what was believed to be a Hollywood fairy-tale marriage that lasted 34 years, ending when Patrick, 57, died of cancer on Sept 14, 2009.

According to the friend, Patrick’s personal hell was made worse in his final months because wife Lisa Niemi kept the actor, who’d shrunk to a pitiful 90 pounds, a prisoner in his own home – banning his mother and loved ones from visiting.

But a year-long investigation by Radar has discovered the Ghost star hid a dark secret and actually died from a broken heart — because Niemi had several affairs with both men AND women.

“He loved her with all his heart but it was a serious love-hate relationship,” the longtime friend told Radar.

“She would beat on him and he would beat on the walls and furniture. They fought and I covered up a lot of that — they destroyed hotel rooms, cars, their house …. It was abusive.”

When asked if Niemi would hit Swayze during his 21-month cancer fight, the friend told Radar: “Oh yeah, it didn’t matter. She wouldn’t hit him with stuff — she would claw at his arms and neck. She would punch and slap him.”

“As he got sick, he was defenseless,” his pal added.

“Cancer bought him from 180 pounds to 90 pounds. She always had to upper hand because he wouldn’t hit her. He was adamant about never ever laying his hands on her.”

In fact, the friend charges Niemi was neglecting her dying husband whenever his main care giver, younger brother Don Swayze, 57, was working or out of town.

“Lisa would be gone for hours doing whatever she was doing and Donnie would come in and Patrick would be lying in his own feces and pee,” the pal said.

The friend who spent years with Swayze and another family insider said Niemi was an “evil” moody control freak who was in charge of every aspect of the actor’s life, his money, movie roles even how much he could spend at the store.

“He had another friend before me and Lisa had a falling out with him — so she pretty much forbade [Patrick] from ever seeing the friend again,” the pal said.

Swayze’s childhood friend, Charlotte Stevens, told Radar she encouraged the star to dump Niemi, who he married in 1975, because of several affairs known only to his family and close friends.

“We would talk like old friends, like what was going on in our lives and [the affairs] would come up,” Stevens, 63, told Radar.

“I would tell him, ‘You mean to tell me she’s having these affairs and you haven’t stepped out on her?’ And he would say, ‘No I don’t want it used against me.”

The humiliated hunk however was hooked on a promise he made to his mother Patsy to never divorce Niemi for fear that she would reveal a dark secret that would ruin his career.

Joan Leighton, who runs the private fan-based chat room called “Perfectly Patrick,” posted a possible explanation as to why Swayze refused to divorce Niemi during a discussion about her infidelities.

“Patsy said to me that she made Patrick promise he’d never divorce Lisa until she [Patsy] was dead… and Lisa threatened to reveal it…. and it would be a scandal… that would hurt maybe someone plus hurt the Swayze family,” Joan wrote in an April 27, 2016 post.

A longtime die-hard fan, Leighton admitted to Radar that she wrote the post but claimed she was just reacting to what was being post by others on the site. She did however call Niemi a “black widow.”

Two months before Swayze died, Niemi, now 60 and remarried, stunned all of Swayze’s friends and family by banning anyone from visiting him at their California home called “Rancho Bizarro.”

And that included his mother Pasty, who died in September 2013 at age 86 – shortly after Niemi attempted to toss her out of the Simi Valley home Swayze had purchased for her and the widow inherited.

“Could you imagine not being able to see your son who is dying?” a family friend close to Patsy told Radar. “It was unexplainable. There is no excuse for it and I don’t know what Lisa was thinking.”

Even more stunning, Swayze wasn’t allowed to leave.

“She wouldn’t let me see him two months before he died!” the pal complained.

“She wouldn’t even let him go outside the ranch… She pretty much kept him prisoner.”

Unable to communicate by phone, the lonely actor, eager for contact with the outside world, would frequently call friends and family in the middle of the night!

“He’d call me a 2 a.m. after she had already passed out and we would talk at that time!” the friend claimed. “It was unusual but yet again that was Lisa, she was that way.”

It was during the same two-month period that Swayze signed a new will that left his entire $40 million estate to Niemi and absolutely nothing to his family.

A handwriting expert commissioned by Radar claimed the signature was a forgery.