A man who killed 51 people at two mosques in New Zealand's deadliest mass shooting is asking an appeals court to discard his guilty plea. Brenton Tarrant says he felt forced to admit to the crimes due to harsh prison conditions affecting his mental health. On Monday, a panel of three judges at the Court of Appeal in Wellington started hearing evidence about his fitness to plead to the charges. Tarrant is also seeking to appeal his life sentence without parole. He argues that his mental health deteriorated in solitary confinement, which led to "nervous exhaustion". Tarrant is a self-declared...