HOUSTON (KTRK) -- The 20-year-old accused gunman in a shooting on the campus property of Texas Southern University is now in police custody.Darrius Nichols, 20, is charged with aggravated assault with a deadly weapon. The Houston Police Department says he's not a TSU student, but the university says he's enrolled as a sophomore and is from Garland, Texas.The shooting happened on Blodgett Street around 8:30pm in the parking lot of the Tierwester Oaks section of the University Courtyard Apartment Complex owned by the university.TSU student Cameron Allen said he was there when the shooting started. "I just started running," he said. "Everybody started running."The TSU officer who first arrived on the scene found a man firing into a crowd, injuring a man and woman. The officer told the shooter to drop his weapon, but HPD says instead he turned, so the TSU officer opened fire. The suspect wasn't injured and surrendered.The male victim, LaKeytric Quinn, is in critical condition at a local hospital. The female victim, Alexandra Nicks, was treated and released from a local hospital. She is not a student, according to HPD.The campus was not placed on a lock down because officials believe it was an isolated incident, Pickens said.TSU student Alex Mayfield said, "This is Texas Southern University, it's a good school, so I mean, I'm not going to let this stop me from coming here or just being a student here."The shooting is still under investigation and is being handled by TSU Police Department and HPD.