Detailed Instructions: Generate a question which can yield the answer mentioned in the input. Generated question must be answered by the answer provided in input, without using any extra knowledge.
Problem:Context : Margie Velma Barfield (nee Margie Velma Bullard) (October 29, 1932 -- November 2, 1984) was an American serial killer, convicted of one murder, but she eventually confessed to six murders.
Answer : murder
Solution:
Which crime led to the conviction of Velma Barfield?