What to know about a mass shooter's bid to undo his guilty pleas for the Christchurch mosque murders

The white supremacist who killed 51 Muslim worshippers in the 2019 Christchurch mosque attacks is trying to withdraw his guilty pleas. The change comes years after his admissions to the crimes brought relief to his victims. Lawyers for Brenton Tarrant on Thursday told New Zealand's appeals court that his prison conditions had induced a state of irrationally when he pleaded guilty in 2020. They say he suffered a breakdown and lost his sense of identity. Evidence from prison staff and mental health experts did not support severe illness claims. Survivors reject his arguments. Prosecutors argue he had chances to raise concerns. Judges still must decide.