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Ex-Michigan State star Adreian Payne dies in shooting (0:33)

Adreian Payne, a former Michigan State basketball player, was shot and killed in Florida. (0:33)

3:41 PM ET

According to court documents released Tuesday, Adreian Payne was shot and killed while trying to help a woman in a domestic dispute.

Lawrence Dority was arrested on a murder warrant and pleaded not guilty. The investigation states that Payne and his girlfriend went to the home of Dority at the request of Mesa.

Payne's girlfriend said Mesa called her to intervene in past disputes with Dority to prevent physical violence.

Payne and his girlfriend were parked near the home of Dority, who arrived with his father in his father's car. Payne was approached by Dority near his vehicle.

There are differing accounts of what happened next. Dority, who is 5-foot-8, told authorities he felt threatened by 6-10 Payne because of his size and claimed Payne told him to smoke during an argument. He said Dority retrieved a gun and shot Payne in the head after Payne reached for a weapon.

There were no firearms in Payne's vehicle.

Payne's girlfriend told authorities that Payne did not pose a threat to Dority and that they showed up only to play. Payne's girlfriend can be heard telling Dority not to pull his gun, and we were asked to come here before Dority fired his weapon.

The father of Dority got out of his car and tried to help Payne, who died an hour after the incident. According to court documents, Dority claimed that he was attacked by a man who tried to shoot him.

Florida is a stand-your-ground state where residents have no duty to retreat and have the right to stand their ground and use deadly force.

After questioning Dority at the police station, authorities determined that Payne did not pose an immediate threat to Dority.

Payne was a member of the All-Big Ten second team in two of his four seasons at Michigan State. He led the team to the Elite Eight in the 2013-14 season and averaged 16.4 points and 7.3 assists for the Spartans.

Izzo said in a statement that he was in shock at the news of Adreian Payne's death. Adreian was loved by his teammates and coaches, who respected his development as a player and a person. He came to Michigan State with a ton of raw talent and put in the work to become an NBA player.

Draymond Green is a teammate of Payne at Michigan State.

Payne played four seasons in the NBA. He was cut by the Magic after he was named in a report by Outside the Lines as having been involved in an alleged sexual assault at Michigan State. Payne spent the last few years of his career overseas after he left the NBA. There were no charges filed.

Adreian Payne was 31 years old.