An Australian appeals court on Friday threw out Erin Patterson's appeal of her murder convictions, The Guardian and AP report. It also ordered that she never be released from prison.

Patterson was convicted last year of murdering her estranged husband's parents, Don and Gail Patterson, and Gail's sister, Heather Wilkinson, with a beef Wellington lunch laced with death cap mushrooms, the outlets report. She was also convicted of trying to kill Heather's husband, Ian Wilkinson, who survived after weeks in hospital. She had been sentenced to life with a minimum of 33 years before parole.

Three judges of the Victoria Court of Appeal dismissed her appeal, the outlets report. They also upheld the prosecutors' claim that her sentence was too light. "This offending was extraordinarily cold and calculated," Justice Stephen McLeish said, The Guardian and AP report. He said her plan to kill lasted about three weeks and used an "elaborate series of deceptions," including a false claim that she had cancer.

Patterson watched the ruling by video from prison, the outlets report. AP says she is only the second woman in Australia sentenced to life without the possibility of parole. Patterson has said the mushrooms got into the meal by accident, AP reports.

The jury had stayed in the same hotel as the police informant and prosecutors, The Guardian reports. The court called that "highly undesirable" but found no proof of wrongdoing, the outlet reports. Patterson can still ask Australia's High Court for leave to appeal, the outlets report.

What we know: The court upheld Patterson's convictions and removed any chance of parole.
What we don't: Whether she will take her case to the High Court.