Topics: Is there a mental message in P!nks song's?
Durham Police said they had no choice but to shut down the meeting on land next to Low Hardwick Farm, near Sedgefield, on safety grounds following the fatality and second injury.
A spokesman said the first incident happened shortly after 1pm on Sunday when a male rider came off his bike and suffered critical injuries.
He was taken by air ambulance to the James Cook University Hospital, in Middlesbrough, but was confirmed dead shortly after arrival.