WELLINGTON, New Zealand — The man responsible for the tragic deaths of 51 Muslim worshipers at two mosques in Christchurch is challenging his past guilty pleas, citing deteriorating mental health due to extended isolation in prison. During a court of appeal session on Monday, Brenton Tarrant argued that the pressures of his confinement led him to admit to the heinous acts under duress, a claim that would require the court to reassess his status before his sentencing.

Tarrant, an Australian national and self-identified white supremacist, initially entered guilty pleas to multiple charges, including terrorism and murder, following the March 2019 attack. The Crown Court heard evidence that he meticulously planned the assault for months, gathering firearms and drafting a manifesto prior to the violence that marked one of New Zealand’s darkest days. If the court accepts his appeal, it could result in a new trial.

The Crown’s lawyers contend that Tarrant was competent at the time of his pleas, suggesting he had other legal avenues available but chose to forego them. They pointed out that Tarrant had consistently received legal counsel throughout the legal proceedings and had the option to delay his trial citing mental health concerns.

In a video presentation from Auckland Prison, Tarrant expressed that his time in solitary confinement had caused what he described as “nervous exhaustion” and confusion regarding his identity and beliefs. He testified that by the time he admitted culpability, he felt he had “little else [he] could do,” implying a lack of clarity stemming from isolation and limited mental stimulation.

The appeal proceedings are taking place with heightened security measures, allowing only select individuals, including some affected by the shootings, to attend. During his testimony, Tarrant appeared composed but acknowledged that he had masked signs of mental distress in prior interactions, contributing to the perception that he was stable.

Crown lawyer Barnaby Hawes challenged Tarrant’s claims, noting that mental health evaluations by prison staff had not indicated significant psychological issues. He emphasized that the absence of documented crises suggested Tarrant had options to pursue differently. Tarrant admitted the intention behind his public demeanor was to reflect confidence, attributed to his ideologies.

As the courtroom awaits a decision, Tarrant’s appeal raises critical questions about mental health in the context of serious criminality. Deliberations will continue throughout the week, with the judges expected to announce their findings soon. Should they dismiss Tarrant’s appeal, a subsequent hearing will address the challenge to his life sentence without parole, a first in New Zealand’s history.