Edwin can be found patrolling Blackwater. However, if Marston has a bounty, Edwin will track him to multiple locations around West Elizabeth. Edwin is the only Blackwater Lawman who will shoot instantly if Marston aims a gun at him.
While most of his fellow officers seem to adopt a stern but fairly polite and friendly attitude when talking to or about John Marston, Edwin seems to have heard the worst about him. He can be heard gossiping about various (usually groundless) crimes Marston apparently committed and even suggesting that Marston should be hanged.