The wife of the late actor Patrick Swayze has denied extraordinary claims she repeatedly beat her husband throughout their marriage and even when he was dying of cancer.

The Dirty Dancing star was married to his former dance partner Lisa Niemi for 34 years before he lost his battle with pancreatic cancer in September 2009, aged 57.

The couple met when they were just 15 years old and were considered to have one of the strongest and happiest marriages in Hollywood.

But now, an unknown person described by RadarOnline as a long time friend of the couple has claimed that the actor, who also starred in Ghost, was the victim of domestic violence.

Patrick Swayze with his wife of 34 years Lisa Niemi. Friends have made a series of extraordinary claims that Niemi would often beat her late husband - even when he was dying of cancer

The friend also reportedly alleged that when the star was in the final weeks of his battle with cancer, Niemi would often neglect him while his main caregiver his brother Don was away, and that Swayze would be left languishing in dirty clothes.

However, Niemi has strenuously denied the claims, with her spokesperson telling MailOnline: 'It is categorically untrue. It is that simple.'

It comes as the unnamed friend told RadarOnline, after what they claimed to be a a year-long investigation: 'She (Niemi) 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 supposedly added: '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.

The Dirty Dancing star was married to his former dance partner Niemi for 34 years before he lost his battle with pancreatic cancer in September 2009, aged 57

Swayze was diagnosed with pancreatic cancer in early 2008, but lost his battle with the disease in September 2009.

'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.'

The friend also reportedly alleges that Niemi would control Swayze's life, telling him how much money he could spend, which friends he could see and what movie roles he was allowed to take.

Meanwhile a childhood friend of Swayze, Charlotte Stevens, also told the website that she had encouraged the star to leave Niemi after he allegedly learned she had affairs with men and women.

She added: '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".'

However, Niemi's rep told Gossip Cop on Tuesday that her client did not know who Charlotte Stevens was.

Swayze and Niemi married in 1975 before he landed his breakout role in the coming-of-age movie Dirty Dancing in 1987.

He also starred in Ghost opposite Demi Moore, crime thriller Point Break and supernatural drama Donnie Darko.

Niemi is now married to jeweller Albert DePrisco, who she married in a small ceremony in Palm Beach in May 2014

The actor was diagnosed with pancreatic cancer in early 2008, but lost his battle with the disease in September 2009. The couple had no children.

Four years after her husband's death in December 2013, Niemi announced she was engaged to jeweller Albert DePrisco.

The couple married in May 2014 after ceremony at the Mar-a-Largo Club in Palm Beach in front of 50 guests.