After a practically undetected first murder, Jerry Brudos escalated quickly in the fall of 1968, taking the lives of three more women before he was identified and apprehended in 1969.
Sources
"Lust Killer" by Ann Rule
"Jerry Brudos: The True Story of the Shoe Fetish Slayer: Historical Serial Killers and Murderers (True Crime by Evil Killers Book 19)" by Jack Rosewood