Waukesha County sheriff’s deputies continue to investigate a freeway crash in which a Good Samaritan was killed while stopping to change a flat tire. It happened late Saturday night on Interstate 94 near Delafield. Deputies say an eastbound motorist stopped to help a group of people with a flat tire on their minivan — and another vehicle came along and struck the minivan, killing the 48-year-old male rescuer and injuring three others — including the 37-year-old man who plowed into the minivan, a 56-year-old woman and an eleven-year-old boy. No names were immediately released, and the crash involved four vehicles.