Riverside posted the following update on their Facebook page regarding the passing of Piotr Grudziński:
On behalf of the family and our own we would like to thank everyone for the support and your presence in those difficult moments. Piotr passed away unexpectedly of natural causes (sudden cardiac arrest) on Sunday morning (21st February). We have remained with emptiness and open wounds which need time to heal. For obvious reasons we have decided to cancel all concerts confirmed for this year. At the same time we would like to inform you that we are going to carry out this year releases scheduled for late spring and autumn 2016.
Thank you for your support.