According to the band’s post on Facebook, Kubik committed suicide, which they described as saying he “walked through the gate by his own hand, through his own will.”

“PK 1975 – 2024 immortal in his legacy – blood (family), soil (home) and monuments of Black Metal art. walked through the gate by his own hand, through his own will. (photo below May 1995 during the recording of Nachthymnen. more following during the next days. keep your respectful distance to the bereaved for now!)”

https://www.facebook.com/abigorblackmetal