Sentence:  Armed with the weapon which was destined to destroy himself, Imnaz sprang down the ladder, — found the door, and, emerging from the abode of crime, sought a more secure resting place, leaving his hostess to discover, with return of day, in whose blood were imbrued the hands of an <WSD>hospiticide</WSD>. 
Meaning of the word marked with <WSD> tags:  One who kills his guest or host.