A Texas man fatally shot his longtime girlfriend and then himself after the couple got into an argument over a winning lottery ticket worth $500.

The murder-suicide occurred Saturday morning in Fort Worth after 46-year-old Terry Martin and 48-year-old Laurice Hampton argued because he didn't want to share the winnings from his scratch-off lottery ticket with her. That's when Martin shot his live-in girlfriend in the chest before turning the gun on himself.

"We received information that the suspect had won $500 on a Texas lottery scratch-off ticket and that the victim wanted half of the proceeds," Fort Worth Homicide Sgt. Joe Loughman said, according to The Fort Worth Star-Telegram. "The suspect didn't want to share it with her."

Despite being critically injured, Hampton managed to call 911 to report the shootings, said Sgt. Loughman.

"She told them that she had been shot and that he had shot himself after he shot her," Loughman said.

Responding police officers found the couple inside the master bedroom of the home that they had shared for several years. Martin was pronounced dead on the scene from a gunshot wound to the head, but Hampton was rushed to the John Peter Smith Hospital, where she died a few hours later.

The sergeant added that the couple had known each other since they were children and were known to have "had a very volatile relationship," he said.

According to Tarrant County court records, Martin was sentenced to spend a day in jail and fined more than $200 in July 2012 for assaulting Hampton in their home back in November 2011.

The Tarrant County Medical Examiner's office confirmed on Tuesday that Martin had committed suicide and that Hampton's death was ruled as a homicide, reports Reuters.