The daughter of a man who was murdered at his home near Bristol said she could not move on with her life until the killer was found.
Barry Rubery, 68, was found dead at his home in Iron Acton in April 2010. He had been tied up and battered to death.
Julie Rubery said: "The person who took our father and the children's grandfather from them is still out.
"We cannot begin to move on with our lives until we find out why this happened," she added.
Mr Rubery was attacked after returning home to Crossing Cottage, Latteridge Road, after a night out with friends.
Police believe he was murdered during a botched burglary, but say he was attacked so ferociously he may have been targeted.
Ms Rubery said it was a shock when she realised the anniversary her father's death would be the same day as the royal wedding.
"When they actually announced 29 April it just made my heart sink because I won't be celebrating.
"A happy occasion is going to be a sad occasion for me."
Det Insp Guy Turner said: " A year has passed since the death of Barry Rubery and this investigation remains very much on-going.
"Someone out there holds that vital piece of information to solve this crime and I would urge you to search your conscience and come forward in the knowledge that the information will be treated in the strictest confidence.
"A year has now passed and the family of Mr Rubery are still searching for answers as to why he was brutally killed for no apparent reason.
"They cannot begin to think about moving on with their lives until they know who is responsible for the brutal murder of Barry."
Chris Lock, one of Mr Rubery's friends, who was with him before he was murdered said they had enjoyed a lovely evening and that the victim was "full of fun".
"I can't understand any of it. He was a generous man - many of us are absolutely devastated. Lots of people remember Barry and speak to me about him. We miss him a lot."