WELLINGTON – The Australian white supremacist who admitting killing 51 worshippers in a mass shooting at two New Zealand mosques has dismissed his lawyers and will represent himself when he is sentenced next month.Brenton Harrison Tarrant had pleaded guilty in March to 51 charges of murder, 40 of attempted murder and one charge of engaging in a terrorist act for the shootings in Christchurch in 2019.His sentencing hearing, delayed by the coronavirus pandemic, is scheduled to begin in Christchurch on Aug.