MARTINEZ — The victim at the center of a criminal probe of East Bay police officers accused of sexual misconduct has dropped her civil lawsuit against Contra Costa County, according to court documents filed Monday.

Attorneys for the 20-year-old, who was a teenager when she was exploited by officers, made the decision to withdraw the suit after Alameda County Judge Jon Rolefson on Oct. 4 threw out charges against former Contra Costa Deputy Ricardo Perez.

Perez was charged with felony unlawful sex with a minor and felony oral copulation and two misdemeanor counts of engaging in lewd conduct. Rolefson dismissed the case, saying the evidence was insufficient and did not show Perez knew the teen was a minor when they had sex.

The Alameda County District Attorney’s Office’s high-profile case, a scandal that drew national headlines in 2016, has taken hit after hit over the past month. The victim, who was known as Celeste Guap, said she had sex with more than two dozen officers, some while she was underage, claims resulting in charges against six current and former police officers.

The DA’s Office dropped charges against Oakland Officer Giovanni LoVerde the day after the Perez ruling. LoVerde faced similar accusations and was due to appear in Rolefson’s courtroom. The same judge in September dropped charges against former Oakland Officer Brian Bunton, who was accused of misdemeanor engaging in prostitution and conspiracy to obstruct justice.

Misdemeanor cases against former Livermore Officer Daniel Black and retired Oakland Sgt. LeRoy Johnson ended in plea deals. No officers have served jail time as a result of the investigation, and only one case remains — a misdemeanor charge against Oakland Officer Terryl Smith, who is due in court Feb. 1.

The case has, however, resulted in the discipline and termination of multiple officers in Oakland, Richmond and Contra Costa.

Perez “lost his job, so he’s no longer a police officer, he got humiliated by all the sexual transgressions that came forth,” said civil rights attorney John Burris, who represents the woman formerly known as Celeste Guap.

Burris and his client already settled for nearly $1 million with the city of Oakland and also have filed a suit against Richmond. No Richmond officers were criminally charged, but nearly a dozen were disciplined, as high up as a lieutenant who was fired.

Burris has no plans to drop the Richmond lawsuit.

“We think that she would be better served if we pursued the case against Richmond and all the officers there,” he said.

Burris said that because the case against Richmond police involved multiple officers, there was a more clear systemic failure on the part of the department as opposed to the case in Contra Costa County, which involved only the single deputy.

On Monday, U.S. District Court Judge Susan Illston signed an order to drop the federal case against Contra Costa County.

Bay City News contributed to this report.