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A deputy with the Bernalillo County Sheriff鈥檚 office has resigned from the agency one week after a grand jury indicted him on felony charges of aggravated battery and child abuse for allegedly using excessive force against a teenage girl late last year.

鈥淔ormer Deputy Bryan Lassley resigned from the Bernalillo County Sheriff鈥檚 Office on Tuesday, June 9, 2026, and is no longer employed by the agency,鈥� said Jayme Gonzales, spokeswoman for BCSO, in a Monday email.

In a resignation letter obtained by the Journal, Lassley wrote that it had been an "incredible honor鈥� to work for BCSO and he thanked the law enforcement agency for allowing him to 鈥渟erve his community.鈥�

Lassley was indicted by a grand jury on June 8 on one count of felony aggravated battery and intentional or reckless abuse of a child resulting in great bodily harm.

He pleaded not guilty in 2nd Judicial District Court on Monday and was released on probation, according to court records.

Lassley was placed on paid administrative leave one week after the Dec. 3, 2025, use-of-force incident occurred. The same day he was indicted, Gonzales said Lassley would be placed on unpaid leave while the criminal case proceeds.

BCSO Sheriff John Allen said during an April news conference that he planned to fire Lassley regardless of what the District Attorney鈥檚 Office found in the criminal investigation.

The charges stem from a Dec. 3 incident after Lassley allegedly shoved a 16-year-old girl by her face and throat into a patrol vehicle after she was detained outside the Bernalillo County Juvenile Detention and Youth Service Center.

In a supplemental report obtained by the Journal through the Inspection of Public Records Act, Lassley states that the use-of-force incident occurred after the teen鈥檚 hair fell in her face as he was attempting to take photos for evidence. 

Lassley in the report said that he had brushed the girl's hair out of her face when she responded by calling the deputy an "(expletive) pig,鈥� according to the supplemental report.

At that point, she told Lassley that she was 鈥渃lose to kicking you in the balls鈥� and began to step toward him, the report states.

Lassley wrote in the report that he was concerned that the teen would assault him after she had already scratched and bit two deputies prior to his arrival. 

Lassley wrote that as the teen began to step closer, he shoved her away and used an 鈥渙pen palm鈥� to create distance between the two, the report states. He then reported that the teen fell back into the patrol vehicle and he put his hand on her head to prevent the teen from biting him.

The teen allegedly kicked Lassley in the shin, which caused him to lose grip of her head, according to the report.

鈥淚 was only able to grab ahold of some hair at this time, as it was the only way to be able to maintain control of (the teen) as she was actively battering me,鈥� Lassley wrote. 鈥淚 forced (her) head to the floor of the unit to distract the mind from the body.鈥�

Lapel footage allegedly showed Lassley shoving the teen's face into the patrol vehicle before he grabbed her hair and slammed her into the floorboard twice, until another deputy stepped in to deescalate the situation.

Gonzales said that BCSO will continue the internal investigation into Lassley and complete the investigation within 180 days per policy. Due to his resignation, Lassley is no longer required to make a statement for the investigation, she said.

Nakayla McClelland covers crime and breaking news. Reach her at nmcclelland@abqjournal.com or at 505-823-3857.