You will be given a context, a subject and a relation. Your task is to generate a question based on the subject and relation. The generated question should include the given subject. Try to use a minimum number of words that are not present in either context, subject or relation while generating question.

Context : John David Duty (April 25, 1952 -- December 16, 2010) was an American who was executed in Oklahoma for first-degree murder. 
Subject : John David Duty 
Relation : convicted of
For what crime was John David Duty prosecuted?