The wife of Fisherman's Friends star Trevor Grills has appealed for a grave marker and little wooden heart on a ribbon to be returned after they were taken from his grave.
The 54-year-old died three days after a metal door fell on him at a music venue in Guildford.
His tour manager, Paul McMullen, was also killed in the incident.
The singer's wife, Lesley, wrote a heartfelt appeal on social networking site Facebook for the items to be returned.
She wrote: "There are some sick people in this world. I'm not sure that they have thought about the hurt and disgust the family feel.
"If you have taken the grave marker and the little wooden heart on a ribbon, please return it quickly. You are a sad, sad person."
Police confirmed yesterday that the grave marker had been unlawfully removed.
Grave markers are placed on new graves immediately after burial for up to a year until a headstone is put in place.
A private funeral was held for Mr Grills at St Endellion Church near Port Isaac last month.
He was a tenor in the sea shanty singing group, based at Port Isaac, near Wadebridge.
Fisherman's Friends have enjoyed commercial success since being discovered singing on the quayside in the Cornish fishing port – a tradition they have continued.