Case File: Ith vs. the Tuatha de Danaan
Police Reports
Case description: The ghost of Ith of the Spanish Milesians accuses the Tuatha de Danaaan of voluntary manslaughter. He came to Ireland, wanting to help them make peace amongst themselves, but the kings weren't having it: they thought he wanted Ireland for himself, and bumped him off.
Case status: Settled. Ith's Milesian relatives came to Ireland and conquered the Tuatha de Danaan, which is enough retribution.