“But why do you assume the killer and victim knew each other?”  He asked.

“Most people feel it’s rude to murder someone they haven’t been introduced to. That’s generally reserved to governments and serial killers.”  was my reply.

There are always subtle clues, as anyone familiar with police procedurals on television would recognize.  Lack of a forced entry, two glasses on the coffee table, both with coasters, and the man’s coat hung in the entry closet, when there are no other signs of a male inhabitant at this apartment.