MISSOULA, Mont. -

William F. "Duke" Crowley, a former University of Montana law professor who helped revise the state's criminal laws and how they could be prosecuted, has died.
    
The Cremation & Burial Society of the Rockies says Crowley died at home on June 25. He was 91.
    
Crowley was born in Walkerville, graduated from the University of Montana Law School and earned an advanced degree from New York University.
    
He served as an assistant attorney general and deputy county attorney before joining the UM faculty in 1966. The school estimates 3,000 students took his classes.
    
Crowley's influence on state law is wide-ranging. He helped revise the state's criminal law and procedures in the 1960s and drafted the Montana Code of Criminal Procedure that was passed by the Legislature in 1967. He also advised the Montana Supreme Court on judicial rules in 1976.