The station then played the national anthem.
Station manager Peter Moore apologised on Facebook.
“Due to a computer error at our main studio, the death of a monarch procedure, which all UK stations hold in readiness while hoping not to require, was accidentally activated on Tuesday afternoon (May 19), mistakenly announcing that HM the King had passed away.
Radio Caroline’s station manager Peter Moore apologised for any distress caused. Photo / Radio Caroline
“Radio Caroline then fell silent as would be required, which alerted us to restore programming and issue an on-air apology.
“Caroline has been pleased to broadcast Her Majesty the Queen’s, and now the King’s, Christmas message and we hope to do so for many years to come.
“We apologise to HM the King and to our listeners for any distress caused.”
King Charles, meanwhile, is alive and well on a trip to Northern Ireland with Queen Camilla.
Recently, while in the seaside town of Newcastle, a bird pooed on the King’s jacket, with a well-wisher telling Charles it was “good luck”.
“At least it didn’t land on my head,” the monarch replied.