A man who allegedly killed his girlfriend Sunday in Nashville was captured here Monday morning after side-swiping another car while driving the vehicle of the woman he had just murdered.The suspected killer, Samuel Copeland, 43, has been charged with criminal homicide for the death of his girlfriend, Porscha Clark, 26. The mother of three was stabbed to death inside her apartment at Trinity Hills Village apartments Sunday night.Copeland was captured here after he side-swiped another vehicle on Highway 70 near Rock Island on Sunday night. No one was injured in the crash.