Ray McDonald
San Francisco 49ers defensive end Ray McDonald (No. 91) looks on during the second quarter of the game against the Chicago Bears at Levi's Stadium, Santa Clara, California, Sept. 14, 2014. Reuters/Ed Szczepanski-USA TODAY Sports

Three months before his domestic violence arrest in August, San Francisco 49ers defensive lineman Ray McDonald and his pregnant fiancée may have been involved a similar incident that involved a gun, according to a newly released police report. Neither McDonald nor his fiancée are mentioned by name in the report, but police responded in May to an incident at the exact address that McDonald shares with his fiancée.

Authorities responded to a 911 call after a heated argument at the address on May 25, TMZ Sports reports. An unnamed woman reportedly grabbed a gun and held it at her side. Though she didn't point the gun at the unnamed male or make any threats, the man said that he was going to call 911. The woman then fled the house. Police didn't make any arrests in connection with the incident, the San Francisco Gate reports. It’s unclear who dialed 911.

McDonald, 30, was arrested on Aug. 31 after a domestic violence incident involving his fiancée at a birthday party held in his honor. His fiancée presented signs of visible injury, including bruising to the arms and beck, police said. McDonald was taken into custody on suspicion of felony domestic violence and released on $25,000 bail.

“I can’t say too much, not right now, but the truth will come out,” McDonald told reporters at the time. “Everybody knows the kind of person that I am. I’m a good-hearted person.”

The incident from May could explain why McDonald hasn't been formally charged for his arrest in August, legal experts told the San Jose Mercury News. A court date scheduled for Monday was postponed.

"The prior police call opens up the issue of self-defense, that he was afraid of her in August because she pulled a gun on him in May, and grabbed her to just try and contain her," Santa Clara-based defense attorney Dan Jensen told the newspaper. "It's a defense attorney's dream. Her whole history of aggression, if there is one, becomes admissible because of that May incident."

McDonald’s domestic violence incident is one of several cases that drew intense public scrutiny since February, when former Baltimore Ravens running back Ray Rice knocked his then-fiancée unconscious during a dispute in an Atlantic City casino elevator. The NFL indefinitely suspended Rice after footage of the assault was made public, but other accused parties, including McDonald, Minnesota Vikings running back Adrian Peterson and Carolina Panthers defensive end Greg Hardy have yet to be disciplined by the league.