Gardaí in Limerick say "all available resources" are being used in their inquiry into the murder of Martin Clancy.
The 45-year old's body was found at his flat in Little O'Curry Street in the city on Sunday.
Detectives declared a murder investigation last night, after reviewing post-mortem results.
Gardaí say Martin was well known in the city, and was often seen walking his dog near his home.
They're appealing for witnesses and are conducting house-to-house inquiries.
Gardaí would like to speak to anyone who might have seen the 45-year-old in the period between New Year's Day and last weekend.
Superintendent Derek Smart, from Henry Street Gardaí, says speculation about how Mr Clancy died is not helpful.
He said: "At this time, I can't say how Martin died but I am treating the investigation as a murder.
"I find that it is unhelpful that there is speculation out there as to how Martin died - that is for us, we know how he came to his death and that is part of our investigation."
