Mick Hughes had run the pub for at least seven years
A team of police divers has been searching a canal next to a pub where a landlord was killed.
The body of 59-year-old Michael Hughes was found in his bedroom at the Royal Oak pub in Pelsall near Walsall on Sunday morning.
A post-mortem examination has shown the divorced father-of-five died from head injuries following an attack - but no weapon has been found.
Cash had been stolen from the pub's safe and West Midlands Police believe the incident was a burglary which went wrong.
On Tuesday, a team of police divers from Nottingham began a search of the nearby Wyrley and Essington Canal for any clues.
Police officers also resumed forensic examination of the pub, on Norton Road, and the car park there remains sealed off.
Detectives investigating the murder said Mr Hughes had closed the pub at 2300 BST on Saturday and had carried on entertaining four friends until 0200 BST on Sunday.
Cleaners discovered his body several hours later.
Detective Chief Inspector Bob Spencer, from West Midlands Police, said Mr Hughes was a very private man who lived alone.
An incident room has been opened at Bloxwich Police Station.