Daniel Holtzclaw, center, cries as he stands in front of the judge after the verdicts were read in his trial.

An Oklahoma County jury handed down a series of guilty verdicts on Thursday night in the trial of former Oklahoma City Police Department officer Daniel Holtzclaw, who allegedly raped and sexually assaulted at least 13 black women in the neighborhood he patrolled.

Holtzclaw, who turned 29 years old on Thursday, faced 36 charges in total. The jury found him guilty of 18 of them, including four of the six counts of first-degree rape. For each of those charges, the jury recommended a sentence of 30 years. The other charges against him ranged from indecent exposure to sexual battery and forcible oral rape. Jurors deliberated for four days over the extensive indictment before rendering their verdicts.

The 13 women who brought allegations against him shared their stories with BuzzFeed. Taken together, they describe a pattern of predatory behavior in which Holtzclaw used his status as a police officer both to coerce his victims during their assaults and to intimidate from coming forward afterwards. Prosecutors also noted a tendency to target women whose credibility would be questioned by both law enforcement and society in general.

By allegedly focusing on poor black women with criminal records, Holtzclaw kept himself from being caught—until he met J.L., a black woman who was just passing through the neighborhood he patrolled. “Not only is this individual stopping women who fit a profile of members of our society who are confronted rightly or wrongly by police officers all the time,” said the [Oklahoma County] prosecutor, [Gayland] Gieger. “He identifies a vulnerable society that without exception except one have an attitude for ‘What good is it gonna do? He’s a police officer. Who’s going to believe me?’”

During the trial, defense attorneys tried to challenge the victims’ credibility by emphasizing their criminal records to the jury and asking about their past drug use. Holtzclaw’s family also accused the victims of fabricating their stories.