Reward: 200 Renown, 500 Gold.
When you return to Orchard Farm later in the game, you'll find the farm owners troubled by the ghost of the man's mother. Go talk to her (she's right behind the house). She'll tell you that she can't rest because of the bandit who killed her and stole her family medallion. He's at Greatwood Lake (to the east). Go there, kill him and return the heirloom to its rightful owners.