Mushroom cook killer Erin Patterson will return to court on Thursday as the deadline looms for her legal team to appeal her conviction and sentence. A new barrister has been brought in to look at Patterson’s case, with her defence team expected to apply in the Supreme Court on Thursday for an extension of time to appeal. Erin Patterson arriving at the Supreme Court. Credit: APPatterson’s 28-day window to appeal ends at midnight on October 6. While prosecutors must decide before then if they wish to push for a sentence increase, a new procedural rule will give her defence team longer to lodge their paperwork.