More than a year after a woman died from hypothermia on Austria's highest mountain, her boyfriend is on trial for gross negligent manslaughter. Kerstin G, 33, froze to death near the summit of the 3,798m Grossglockner on 19 January 2025 during a stormy climb. Prosecutors say her boyfriend, Thomas P, left her unprotected and exhausted while he sought help. He denies the charges, calling the death "a tragic accident." Prosecutors say Thomas P was the "responsible guide for the tour" and made nine key mistakes, like starting too late, using poor equipment, and failing to turn back despite strong winds and cold temperatures below -8C with windchill of -20. His lawyer, Karl Jelinek, argues both were experienced and well-prepared. The couple reached a point called Frühstücksplatz where turning back was no longer an option. The boyfriend called mountain police at 00:35 on 19 January but allegedly put his phone on silent afterward. He left Kerstin about 40 meters below the summit to get help at around 2 am but delayed notifying emergency services until 3:30 am. The strong winds stopped helicopter rescue. Kerstin died alone on the mountainside. If found guilty, Thomas P faces up to three years in prison. The case may impact future mountain climbing rules and liability.