Avon and Somerset Police wrote on their Glastonbury-related Twitter account:
Unfortunately the man taken ill after a suspected reaction to ketamine has died this morning. His family are aware and being supported.
More top news
Freezing temperatures, a biting wind and risk of snow into next week
Austerity and Brexit are dividing Britons and causing a "schism" in society, the Archbishop of Canterbury has warned.
A taxi driver has been suspended after inspectors found he was using a Costa Coffee lid as a fuel cap.