Florida man kills girlfriend and her 3 children in mass shooting.

A man allegedly killed his girlfriend and her three children in a "senseless" mass shooting in a Florida apartment. The victims were ages 40, 21, 17, and 11. The suspect fled the scene and was later tracked down to a motel where an hours-long standoff and negotiations ended with an officer-involved shooting. The suspect was pronounced dead at the scene. The motive for the shooting is unknown.