A ninth suspect was arrested Thursday in an assault on three people outside a north-side bar last month.

Brittany Trostle was booked into the Pima County jail on suspicion of three counts of aggravated assault, said Deputy Tom Peine, a Pima County Sheriff’s Department spokesman.

Her booking photo will be released Friday, Peine said.

Investigators are searching for one more participant in the assault that occurred about 2:40 a.m. Feb. 17 on a woman, her son and a friend outside the Outlaw Saloon, 1302 W. Roger Road, Peine said.