Brenton Tarrant, the Australian white supremacist who killed 51 people in two Christchurch mosques in March 2019, will appear in New Zealand's Court of Appeal this week. He aims to withdraw his guilty plea and also appeal his life sentence with no parole. Tarrant had admitted to murdering 51 people and attempting to kill 40 more. The 35-year-old previously denied charges but changed his plea a year after the attack. He now claims he was unable to make rational decisions due to "torturous and inhumane" prison conditions. The court hearing in Wellington will last all week, and Tarrant is expected to give evidence via video link. Victims and families can watch a delayed broadcast. Aya al-Umari lost her brother Hussein in the attack. She said, "I very distinctly remember that I left court after the sentencing thinking 'Right, the trauma chapter is now closed, time to heal, time to focus on your own mental well-being', but then it pops up again and again." She added, "I suspect one of his main motivations to do this is to open up traumas again and I won't let him succeed in doing that - he just wants his limelight and to be relevant again." Hussein al-Umari was awarded a New Zealand Bravery Star for standing up to Tarrant. At sentencing in August 2020, New Zealand Prime Minister Jacinda Ardern said the life sentence meant Tarrant would have "no notoriety, no platform... and we have no cause to think about him, to see him or to hear from him again." If the court allows the guilty plea withdrawal, Tarrant may face a full trial. If not, a later hearing will consider his sentence appeal. Tarrant moved from Australia to New Zealand in 2017, where he planned the attack and posted a 74-page manifesto online. The killings led to New Zealand passing tough gun laws, banning military-style semi-automatic weapons, and launching a weapons buy-back scheme.