This story idea is about a futuristic P.I. or police detective. A prominent AI scientist has been murdered. The killer is actually his latest attempt at an AI. The computer/robot was trying to prove it had achieved sentience, but the deceased didn’t believe it, thought it was still just the sum of its parts, nothing greater. The machine decided the only way to prevent being shutdown like its predecessors was to prove to the world that it was capable of a very human action, murder.