Police investigating the murder of Barry Rubery at his home in Iron Acton more than three years ago say they've been contacted three times by an anonymous caller who may hold vital information.
Detectives say the calls were made shortly after the murder of the 68 year old in April 2010, then in January 2012 and most recently in June of this year.
Police in South Gloucestershire say they would like urgently to speak to whoever left the messages.
Detectives have renewed their appeal for help to find out who killed Barry Rubery. The grandfather was murdered three years ago today at his home in South Gloucestershire.
Mr Rubery had been out with friends on Wednesday April 28, 2010. He returned to his home at Crossing cottage in Iron Acton at around 10.45pm that evening. He was found with serious head injuries the morning after.
Superintendent Mike Carter said: "While a number of years have passed since Barry's death, we have not given up on this investigation. We are constantly reviewing information and making further enquiries in a bid to bring the person or people responsible for Barry's death to justice."
Detectives investigating the murder of Barry Rubery have made a new appeal on the second anniversary of his death.
The 68 year old grandfather was killed at his home in Iron Acton in South Gloucestershire.
Police have released a picture of a footprint found at the scene in the hope that it might lead them to the killer or killers.