Sentence:  Rumors of the offer Tom Horn had made at the Stockgrowers' Association meeting had leaked out by then , and as a grand jury investigation of the <WSD>murder</WSD> got underway , the prosecuting attorney , a Colonel Baird , ordered that the tall stock detective be summoned for questioning . 
Meaning of the word marked with <WSD> tags:  unlawful premeditated killing of a human being by a human being