In her first American television interview, the sister of an Irish businessman who was murdered in Winston-Salem speaks out to defend his honor, she talks to 48 HOURS' Maureen Maher. 

The episode titled “In Jason’s Name” aired Saturday night, April 20, on WFMY News 2/CBS.

WATCH: Full 48 Hours Episode Here

Jason Corbett was beaten to death with a brick paver and a baseball bat in 2015 by his American au-pair-turned-wife Molly Corbett and her father, former FBI agent, Tom Martens. 

Corbett and Martens maintained they killed Jason Corbett in self-defense after he tried to strangle Molly. They claimed he was abusive to Molly for years and he had been threatening to kill Molly the night he died. 

RELATED: Thomas Martens, Molly Martens Corbett Found Guilty In Jason Corbett Trial

NC Prosecutors said Corbett’s death was murder.

Now, Tracey Lynch is trying to set the record straight on her slain brother.

“They claimed it was self-defense,” Lynch tells 48 HOURS’ Maureen Maher.

“The Martens didn’t just murder Jason,” Lynch says. “They tried to destroy his character.”

“Jason was an amazing human being,” Lynch says.

Jason Corbett was a 30-year-old father of two in Ireland, who suddenly found himself a widower when his first wife died of an asthma attack. He then decided he needed help with the children and hired Molly Martens, originally from Knoxville, Tennessee. Soon, their relationship turned romantic and they were married. Shortly after, they moved to the United States.

That’s where the story turns leading up to the fateful night of August 2, 2015.

Tom Martens told a 911 dispatcher that his son-in-law got into fight with his daughter and he had to intervene. “He’s bleeding all over and I, I may have killed him,” he said.

Molly also told police that Jason, then 39, was “screaming ‘I’m gonna kill you.’”

“I just couldn’t process it,” Lynch says 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.”

Lynch tells Maher that before his death her brother said he was unhappy and wanted to move 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.”

Molly Corbett and Tom Martens were arrested and charged with killing Jason Corbett. They were convicted of second-degree murder in 2017, but have maintained their innocence. Earlier this year they sought to get their convictions overturned on appeal. The court has yet to rule.l

48 HOURS: “In Jason’s Name” takes viewers into the courtroom for the hearing.

Maher and 48 HOURS investigated Jason Corbett’s death, the trial and appeal through interviews with his friends and family, Molly Corbett’s friends, investigators, defense attorneys and more.

While awaiting a court decision, Lynch, who with her husband cares for her brother’s children in Ireland, continues to fight for her brother.

“I would have done anything I needed to do to take justice for Jason,” Lynch says.

Previous stories on the Jason Corbett Case:

RELATED: Attorneys File to Have Verdicts in Corbett Trial Dismissed; Cite Jury Misconduct

RELATED: Thomas Martens, Molly Martens Corbett Found Guilty In Jason Corbett Trial

RELATED: Corbett Murder Trial In The Hands Of The Jury

RELATED: Closing Arguments Underway In Corbett Murder Trial

RELATED: Jury Selection Starts In Davidson County Murder Case

RELATED: Wife, Father-In-Law Released on Bond In Davidson Co. Murder Case

VIDEO: August 2017: Jury Deliberates the ason Corbett Murder Case