Two more verbal confrontations in the bar followed before Bates was attacked in the parking lot, police alleged.
The charges against Cooper were dismissed earlier this month when the victim and police failed to appear at his preliminary hearing. Prosecutors made the decision to proceed directly to the grand jury.
Also Wednesday, Mark Anthony Johnson, 29, was indicted on a charge of first-degree sexual assault.
He is accused of forcing another inmate to have sex with him while he was in jail awaiting trial on a kidnapping charge.
Johnson already is serving a life term with no chance of parole for kidnapping a Gaithersburg, Md., man in August 1996. At his trial for that incident, Johnson also was found guilty of attempted first-degree murder, bringing stolen property into the state, conspiracy to commit kidnapping, conspiracy to attempt first-degree murder and conspiracy to bring stolen property into the state.
While awaiting trial for those charges, Johnson was charged in the rape of a man in the Eastern Regional Jail.
Johnson and the 19-year-old had adjoining cells on April 27 when the attack occurred, according to court documents.
The man told prosecutors his attacker often made sexual remarks to him and offered bond money for sex, records show. When the 19-year-old declined, the man forced him, police alleged.
Also indicted Wednesday:
An 82-year-old Martinsburg man on a charge of incest, three counts of first-degree sexual assault and sexual abuse by the custodian of a child in the molesting of his great-granddaughter for three weeks in 1994.
According to allegations contained in court records, the 11-year-old girl came from out-of-state to visit for her grandmother's birthday when the attacks occurred. Police were notified two years later, when the girl told her mother.
A 72-year-old Hedgesville, W.Va., man on four counts of first-degree sexual abuse and one count of first-degree sexual assault in the molestation of the 10-year-old daughter of a family friend in October 1996.
Court records state the girl stayed with the man and his daughter, who was a friend of the child's mother, while the girl's mother was hospitalized. Police were notified the next month, when the 10-year-old started asking her mother questions about rape.
Jeffrey B. Anderson, 36, of Gerrardstown, W.Va., on a charge of unlawful wounding against Cpl. Richard Copenhaver of the Berkeley County Sheriff's Department.
According to court documents, Copenhaver took Anderson to City Hospital in Martinsburg on Aug. 20 after his arrest in a domestic assault. Someone had signed an involuntary mental petition against him, documents stated.
While handcuffed, the man struck Copenhaver several times in the face and head with the cuffs, court documents allege. Copenhaver sustained a cut lip that required stitches, a black eye and bruises and scratches on his face and neck, according to court records.