Brother to Captain Joseph Redpath, Carlin fell during the battle of Darrowshire. Although terribly wounded, he was not slain. Days later, agents of the Argent Dawn found Carlin wandering, weak from thirst and fever, near Corin's Crossing. They tended to his wounds and brought him to Light's Hope Chapel. Grateful for their charity, Carlin joined the ranks of the Argent Dawn and now fights a battle of vengeance against the Scourge.
He might have been the Redpath referred to in the quest , which would have made him a member of the Theramore city guard at some point.
He starts the following quests:
Wrath of the Lich King
Carlin Redpath can be found in Stratholme Past staying on the second floor in an inn on the outskirts of Stratholme. He is with his family including, Joseph Redpath, Pamela Redpath (along with her doll), and Marlene Redpath.