Given a question and a context passage, generate the answer having the word or phrase from the context passage. Here, the answer should be a shortest continous span from the passage.

Context: Arnold of Selenhofen (c. 1095/1100 -- 24 June 1160) was the archbishop of Mainz from 1153 to his assassination in the benedictine abbey St. Jakob, where he took shelter from the raging crowd.
Question: Was the death of Arnold of Selenhofen an accident or suicide?
assassination