In a statement to ABC News on Monday, Martin's daughter, McKenzie, defended her father.

“My dad is an American hero. He’s served his whole life and before this had a spotless record,\" Martin's daughter said in her statement. \"We believe that he is innocent of these charges and hope that the truth will come out.”

Martin is scheduled to be arraigned on May 22 at the Christian County Justice Center in Hopkinsville, Kentucky. If convicted, he could face the death penalty, prosecutors said.

He is being held without bail.

At the time of the slayings, Martin lived across the street from the Phillips couple and Dansereau.

In a 2016 interview with NBC affiliate station WSMV-TV in Louisville, Martin claimed Calvin Phillips was having an affair with his wife but denied any involvement in the murders.

Asked in the interview if he believed he would be charged in the killings, Martin told WSMV, \"No, I have no worries about that.\"

Martin allegedly broke into the Phillips' home on Nov. 18, 2015, and fatally shot Calvin Phillips with a .45 caliber pistol, according to an indictment unsealed on Monday. That same day, he allegedly shot and killed Pamela Phillips and Dansereau with a .22 caliber firearm, according to the indictment.

Martin allegedly put the bodies of Dansereau and Pamela Phillips in a car and drove into a cornfield several miles from their neighborhood and set the vehicle on fire with the victims' bodies inside, according to the indictment.

The killings occurred just days before Martin faced a military court-martial on charges of on abuse of a child under the age of 16 and conduct unbecoming an officer, according to military records. Martin was ultimately found guilty on lesser charges of mishandling classified information and simple assault, according to records.

He was dismissed from the military and placed under \"confinement for 90 days,\" according to the records.

His attorney said Phillips was scheduled to testify in the court-martial proceedings, but the nature of his testimony was unclear.

Martin's defense lawyer, Tucker Richardson, told ABC Nashville affiliate WKRN that Phillips and Martin were friends, adding that he doesn't believe Martin committed the murders.

\"All I can say is that man didn't kill those three people,\" Richardson said.

Richardson said that Phillips, who initially was set to testify against Martin in the case, was actually going to be the defense's \"star witness,\" adding that if prosecutors believe Martin killed Phillips because he was due to testify, there is \"nothing further from the truth.\"

\"So, it just floors me,\" Richardson said. \"I don't know what they came up with after four years that led to this indictment.\"

Richardson will likely not be representing Martin for the murder trial but may serve as an adviser to the defense team, he said.

Shortly after the homicides of the Phillips couple and Dansereau, Martin moved to North Carolina.

A former Army helicopter pilot, Martin began working as a pilot for PSA in January 2018, according to the airline.

In a statement to ABC News, American Airlines officials said Martin passed a routine criminal background check that found \"no criminal history that would disqualify him from being a commercial pilot.\"

\"All of us at American Airlines and PSA Airlines are deeply saddened to have learned about these allegations from 2015,\" the airline's statement reads. \"Our team was made aware of the indictment [Saturday] morning after his arrest at Louisville International Airport. We have an unwavering commitment to the safety and security of our customers and team members, and we will provide any investigative assistance possible to law enforcement throughout their investigation.\"

ABC News' Mike Repplier contributed to this report.

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