Nassau Bay police are looking for the suspect who hit and fatally injured an officer while driving away from a traffic stop on Tuesday night. Officers had pulled over a driver and tried to arrest him when they found out he was wanted in Harris County for domestic violence. The man sped away from the scene and ran into 43-year-old Sergeant Kayla Sullivan. She later died at Houston Clear Lake Hospital. She's the first Nassau Bay officer killed in the line of duty.