A white male in his 30s who was known to police killed four people and wounded 21 others on Saturday in a gun rampage between the West Texas cities of Midland and Odessa that started with a traffic stop and ended when he was killed by officers.br br The suspect hijacked a postal van and opened fire on police officers, motorists and shoppers on a busy Labor Day holiday weekend before being shot dead outside a multiplex cinema complex in Odessa.