Sister of Irish businessman killed by his model wife and her ex-FBI father ...

The sister of an Irish businessman who was brutally murdered by his American wife and her ex-FBI agent father in 2015 denies their claims that the killing was in self-defense.

Tracey Lynch has accused Molly Corbett and her father, Tom Martens, of ‘destroying the character’ of her late brother, 39-year-old Jason Corbett.

‘Jason was an amazing human being,’ Lynch tells CBS’s 48 Hours.

‘They claimed it was self-defense...The Martens didn't just murder Jason.

‘They tried to destroy his character.’

Tracey Lynch, the sister of an Irish businessman who was brutally murdered by his American wife and her ex-FBI agent father in 2015, denies their claims that the killing was in self-defense

Tracey Lynch, the sister of an Irish businessman who was brutally murdered by his American wife and her ex-FBI agent father in 2015, denies their claims that the killing was in self-defense

Lynch has accused Molly Corbett (right) and her father, Tom Martens, of ‘destroying the character’ of her late brother, 39-year-old Jason Corbett (left)

Lynch has accused Molly Corbett (right) and her father, Tom Martens, of ‘destroying the character’ of her late brother, 39-year-old Jason Corbett (left)

In August 2017, Molly Martens Corbett (above) and her father, Thomas Martens were convicted of second-degree murder for the killing of Jason Corbett

In August 2017, Molly Martens Corbett and her father, Thomas Martens (above) were convicted of second-degree murder for the killing of Jason Corbett

In August 2017, Molly Martens Corbett (left) and her father, Thomas Martens (right) were convicted of second-degree murder for the killing of Jason Corbett

Tom Martens told a 911 dispatcher that his son-in-law got into a fight with his daughter and he needed to intervene.

'He's bleeding all over, and I, I may have killed him,' he told the dispatcher. 

Molly Corbett told investigators that her husband was 'screaming "I'm going to kill you".'

Lynch, however, says this was not the brother she knew.

'I just couldn't process it,' Lynch tells CBS News of her brother's death. 

'It was that, you know, he was my best friend. 

'We were just two of the closest people in the world to each other outside my husband and children.' 

The pair first met and became romantically involved when Molly worked as a nanny for Jason's two children after his first wife Margaret passed away

The pair first met and became romantically involved when Molly worked as a nanny for Jason's two children after his first wife Margaret (above) passed away

The pair first met and became romantically involved when Molly worked as a nanny for Jason's two children after his first wife Margaret (right) passed away

Molly said Jason became more controlling and physically and verbally abusive as time went on

Molly said Jason became more controlling and physically and verbally abusive as time went on

Molly took on the role as mom to the kids after Jason's previous wife passed away

Before the murder, she says her brother confided to her that he was unhappy in their marriage and thinking of returning home to Ireland.

'He said she was acting strange,' Lynch says of Molly Corbett. 

'He would open up and say they were having difficulties, and then he would change the subject.' 

This past January, lawyers for Tom Martens and Molly Corbett asked a three-judge panel of the North Carolina Court of Appeals to overturn a second-degree murder conviction from August 2017.

The lawyers said that the jury in the case was not permitted to hear evidence that they say would have corroborated their claims of self-defense, according to the News & Record of Greensboro.

A ruling on the matter is expected sometime this year.

Molly Corbett met her Irish spouse back in 2008 when he hired her as a nanny to care for his two young children after his previous wife passed away from an asthma attack. 

The two quickly grew romantically involved, and eventually relocated their family to North Carolina.

With time, Molly said Jason became more controlling as well as physically and verbally abusive — a claim his two children also admitted during questioning.

Martens Corbett alleged Jason choked her the night of his death, when her father, who was present at the home, intervened with a baseball bat and a brick paver. 

Molly and her dad testified during the month-long trial in 2017 that they were trying to protect one

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