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Ed Cantrell (December 21, 1927 – June 11, 2004) was the public safety director of Rock Springs, Wyoming, a town tied to widespread corruption, who killed one of his own officers in 1978 but was acquitted after trial.The son of Samuel Glenn Cantrell, a Nazarene minister and Vesta Marie (née Robinson) Cantrell, Ed was born in Bloomington, Indiana. He excelled in sports and graduated from Plainfield High School in 1945 with a football and basketball scholarship. Aspiring to be a coach, he had almost completed three years at Indiana State College when President Truman ordered the Berlin airlift in 1948. Cantrell immediately enlisted in the Army and spent three years as a military policeman in the "bombed-out ruin" south of Frankfurt, Germany. His tour of duty was then extended due to the Korean War. Upon discharge, he graduated with honors from the Indiana State Police Academy.
An avid hunter, fisherman and marksman, he later visited Wyoming and decided to relocate there. Accepted into the Wyoming Highway Patrol, he was assigned to the Rock Springs area in 1960. Although he liked his job, he later resigned from the highway patrol to lobby for a state police bill. "A little skeleton crew of highway patrolmen and a sheriff's department were understaffed," he said, explaining that he and his fellow officers were trying to create a more effective state police force.
The following January he was hired as a range detective in Lusk. His job took him all over Wyoming as well as neighboring states in pursuit of lawbreakers. Then, in 1976, following the death of his oldest son in a car accident, Cantrell and his wife decided to return to Rock Springs, where he worked for undersheriff Jim Stark. The following year Cantrell assumed the post of safety director of a badly demoralized Rock Springs police force. He then formed a detective division from existing officers and hired Michael Rosa as an undercover detective.