The shooting happened at the Duke Health Center on North Duke Street just north of I-85 near the Durham Regional Hospital.
The autopsy shows the victim, 49-year-old Charlene Bullock King, was shot six times in the stomach and chest by 52-year-old Burnette Taylor.
Relatives say King had worked at the center for 27 years as a phlebotomist.
They say she and Taylor had fought prior to the shooting because King decided to leave the relationship.
After Taylor walked in the front door of the clinic on May 4, he opened fire. Durham police quickly swarmed the area trying to find Taylor, who took off on foot.
Witnesses reported the gunman ran into a wooded area behind a house on Carver Street. They reported hearing multiple gunshots before Taylor was seen lying on the ground.
Officers shot Taylor and he was taken to Duke Hospital where he later died.
Taylor had a long criminal record. According to the North Carolina Department of Corrections, he was a registered sex offender after convictions for second-degree rape and kidnapping in 1993. He also had convictions for car theft, larceny of firearms, resisting arrest, and drunken driving.
After serving time for those crimes, he was released and apparently began dating another woman, who last year accused him of assault. The woman even requested a temporary restraining order, describing a violent episode in which Taylor beat her unconscious. In court documents she wrote, "He continued to slap, kick, punch me with his fists. Blackening both my eyes, fracturing my ribs, my liver was cut due to a kick."
Probation officers put out warrants for Taylor's arrest beginning in November 2009.
State correction officials say Taylor's probation officer made every attempt to locate him, but officers never managed to track Taylor down, until six months later when Durham police officers shot him.
Officials with the North Carolina Department of Correction also say their revue shows the probation officer made numerous attempts to find Taylor over the last six months at his last known address and by contacting his family members, but Taylor was willfully fleeing supervision.