On April 18, 1966 , Officer Ernest Brockman was killed in a five-car vehicle accident on St. Charles Rock Road as he was responding to an accidentally triggered hold-up alarm at Mark Twain State Bank in Bridgeton. Officer Brockman sustained head injuries in the accident and died at County Hospital at 3:35 p.m.

Officer Brockman was a US Army veteran. Interred: Oak Hill Cemetery, Kirkwood, Missouri. He was survived by his wife and 18 month old son.