Generate a correct and concise answer for the question based on the words in the context.

Context : Randy Steven Kraft (born March 19, 1945) is an American serial killer known as the ''Scorecard Killer'' and the ''Freeway Killer'' who committed the rape, torture, mutilation and murder of a minimum of 16 young men in a series of killings spanning between 1972 and 1983, the majority of which had been committed in California.
Question : Which crime led to the conviction of Randy Steven Kraft?
murder