DETECTIVES have interviewed more than 800 people in the hunt to find the killer of 45-year-old Andrew Batterton from Widnes.
Mr Batterton, known to many as Fatta, was killed at his Hale Road home on January 10 and, despite several lines of enquiry, there is still no clue as to why anyone would want him dead.
To date, more than 800 people have been questioned, with three of those arrested, interviewed, and subsequently released without charge.
Detective Chief Inspector Chris Ankers, who is leading the murder enquiry, said: 'This has been an extensive and exhaustive enquiry, but sadly we have yet to identify Andrew's killer.
'Somebody is holding the vital piece of evidence which will lead us to the person who ended Andrew's life and left four children without a father.
'There is still a £30,000 reward available to anyone who provides information which leads to the conviction of Andrew's murderer.
'The Batterton family have had to cope with two losses in a short space of time, as Andrew's ex-wife Lorraine died in November last year, and we are still struggling to understand how anyone could want to kill Andrew.
'By coming forward with information, regardless of how small, you could help us bring a killer to justice and help a family to start to rebuild its life.'
Mr Batterton was found with multiple stab wounds to his chest, side and back. He died later at Whiston Hospital.
No murder weapon has been found, there was no sign of forced entry or property stolen and there is no suspicion he was involved in criminal activity.
A reconstruction was aired on BBC's Crimewatch programme but police described the response to the televised appeal for witnesses as 'disappointing'.
Appeal posters have also been pinned up throughout the town.