DALLAS — Darrell Armstrong, an assistant coach for the Dallas Mavericks, was arrested on Saturday for aggravated assault with a deadly weapon, as confirmed by multiple law enforcement sources to WFAA.

According to reports from Dallas PD and sources that spoke to WFAA, the 56-year-old coach was involved in a dispute with a woman, during which he allegedly struck her with a handgun and threatened to shoot her.

The arrest affidavit reveals that police responded to a disturbance call at 1001 Ross Ave., a downtown Dallas apartment complex, around 2:15 a.m. on Saturday. Upon arrival, officers located the victim in a nearby parking lot accompanied by her father, as stated in the affidavit.

As per the affidavit, the victim, who had been in a relationship with Armstrong for several months, recounted that she discovered a text message from another woman on his phone, which escalated into a verbal conflict. She informed the authorities that Armstrong had been drinking and became increasingly angry, demanding the apartment keys, which she handed over.

During the altercation, while on a call with someone else, Armstrong allegedly retrieved a handgun, circled around the kitchen island, and struck the victim on the right side of her face with the weapon. The document reports that he then loaded the gun and threatened, “I am going to shoot you.”

The victim fled the apartment and went to a nearby 7-Eleven to wait for her family, as detailed in the affidavit. Arriving officers noted a visible mark on her right cheek.

Witnesses reported seeing Armstrong intoxicated and verbally abusing the victim during the incident, according to the affidavit.

The document further indicates that officers knocked on the apartment door and took Armstrong into custody without resistance. The firearm was located under the couch where Armstrong indicated he was sleeping, with a loaded magazine but no round in the chamber.

The affidavit noted that Armstrong and the victim had been in a “cohabitating relationship” since September 2024. It also revealed a history of domestic violence, including an incident involving strangulation, that the victim chose not to report to law enforcement to avoid complications for Armstrong’s career.

As per jail records, Armstrong was booked shortly before 7:30 a.m. on Saturday on charges of aggravated assault with a deadly weapon, with a bond set at $35,000. He has since posted bond.

WFAA has reached out to both the Dallas Mavericks and Armstrong for their comments on the situation.

The Mavericks responded to WFAA with a statement saying:

“The Dallas Mavericks are aware of an incident involving a member of our staff and are gathering all relevant information surrounding it. We take this matter seriously, and the employee has been placed on administrative leave pending the legal process. The appropriate legal authorities are reviewing this matter, and we will refrain from further comments while proceedings are ongoing.”

As of the publication date, WFAA has not received a response from Armstrong.

In his 10th season as an assistant coach, Armstrong originally joined the Mavericks during the 2008-2009 NBA season. Prior to transitioning into coaching, Armstrong played 14 seasons in the NBA, representing teams such as Orlando, New Orleans, Indiana, New Jersey, and Dallas. He notably won both the NBA Sixth Man Award and the Most Improved Player Award in 1999.

Armstrong was traded from New Orleans to the Mavericks in 2004, where he participated in 114 games and even made an appearance in the 2006 NBA Finals.

This story is developing, and WFAA will continue to provide updates as more information becomes available.