A Clash of KingsEdit
Shagwell stays at Harrenhal with the other members of the Companions. He assists in the slaughter of the Lannister garrison, killing and decapitating two unnamed knights, who's heads he uses in a puppet show afterwards. He spreads the story of Arya Stark helping in the massacre, as she assisted Rorge, Biter and Jaqen H'ghar in freeing the Northern prisoners. He introduces Arya to Lord Roose Bolton when he arrives, but he doesn't seem to recognize her.
It is Shagwell who strikes the final blow to Ser Amory Lorch, kicking the Lannister knight into the bear pit of Harrenhal, where he has to fight a bear to the death whilst naked.
A Storm of SwordsEdit
Shagwell is one of the Companions that escorts Ser Jaime Lannister and Brienne to Harrenhal after they are taken prisoner. He kicks Jaime to the ground so that Zollo can chop off his swordhand, as per Vargo's customs and orders. Shagwell, Zollo and Rorge try to rape Brienne, but they are thwarted by Jaime.
A Feast for CrowsEdit
Shagwell, Pyg and Timeon abandon the now mad Vargo to his castle. Instead they head to Maidenpool, hoping to find passage there back to Essos. They can't find anything and are instead directed to Cracklaw Point by Dick Crabb. Brienne picks up their trail, thinking that the fool mentioned might be Ser Dontos Hollard, and is reacquainted with Shagwell. The Fool kills Dick, but Brienne kills Timeon and Pyg. Shagwell is distracted by Podrick Payne, and afterwards Brienne forces him to dig a grave for Dick. Shagwell does so, but tries to kill Brienne with a rock. Instead she stabs him to death with her dagger.