HOUSTON -- A jewelry store clerk shot and killed a robber in southwest Houston.Police say the robber tried to hold up Jade Jewelers on Westheimer and Wilcrest just after 4pm.The clerk shot the robber in the head. That robber was pronounced dead at the hospital.Police are also looking for a woman seen running away from the store so they can question her. Right now they don't know if she's connected to the case.