Killed, murdered (5)
I believe the answer is:
slain
I believe this clue is a double definition.
'killed' is the first definition.
(slaying is a kind of killing)
'murdered' is the second definition.
('slay' can be a synonym of 'murder')
(Other definitions for slain that I've seen before include "Killed, murdered" , "Violently killed" , "Put to the sword" , "Slaughtered" .)