He was not deemed to be running away, because he had just had a full meal, too large to have been consumed while in flight.
Oetzi also had with him a copper axe, the oldest one known in existence, that would have been a sign of great wealth and status. Had he been an outsider, the person who killed him would have certainly made off with the axe, UNLESS by being in possession of it, he would be making himself a suspect in the murder. He also broke off the shaft of the arrow in Oetzi’s back. That may well have been to prevent its being identified as one of the killer’s arrows had the body been found. He was covering his tracks.
It was Colonel Mustard in the Library with a candlestick!................