From A Wiki of Ice and Fire
|Died||In 299 AC, at the Twins|
|Book(s)|| A Clash of Kings (appears)|
A Storm of Swords (appears)
A Feast for Crows (mentioned)
A Clash of Kings
A Storm of Swords
At some point, Donnel is released from captivity, most likely at the re-capture of Harrenhal. He attends the wedding of Lord Edmure Tully at the Twins. He is among those nobles killed during the Red Wedding, getting hit with crossbow bolts.