Up to 50 gardaí are involved in the investigation into the murder of 62-year-old Michael Healy, who was found in the bathroom of his top-floor bedsit flat last Thursday morning.
A postmortem carried out by State Pathologist Professor Marie Cassidy revealed that the separated father-of-two died from a blow to the head.
Supt Tom Myers, who is leading the Garda investigation, said it was possible that somebody had robbed the taxi driver who had been working as a driver in the city for the past 10 years.
However, he said gardaí were keeping an “open mind” on the motive for the murder.
Forensic experts continued yesterday to comb the bedsit at 3 Rocksprings Terrace, St Luke’s, its front and rear gardens and adjoining waste ground for clues to the killer’s identity.
A forensic scientist also travelled to the scene to help the investigation team.
Detectives have also spoken to the tenants in the seven other bedsits at the three-storey apartment building and in adjoining buildings.
The body of Mr Healy, who was originally from Grenagh, was discovered by his brother, Dermot, shortly after 9.30am last Wednesday. Mr Healy’s relatives became concerned for him after they hadn’t had any contact with him for several days.
Supt Myers said a positive sighting of Mr Healy’s taxi, a black Toyota Avensis, registration 03 C 4073, had been made in the city centre at 10.30am on Friday, September 17.
He said detectives were trying to corroborate a second reported sighting the following morning, again in the city, at around 8.45am.
Mr Healy was a hard-working man, who often put in up to 15 hours a day. During weekdays he worked the day shift, but then switched to night work at the weekends.
Normally he only took Sundays off and gardaí believe that, if he was alive last Sunday, he may have been socialising in the MacCurtain Street area.
They are checking pubs and CCTV in an effort to trace his last movements.
There was no sign of a forced entry at Mr Healy’s flat, so he may have known his killer or simply left the front door unlocked.
His taxi was found parked outside on the main road and it was still being examined yesterday by Garda technical experts.
While gardaí are trying to establish if he was attacked in the vehicle, the indications seem to point to the attack taking place in flat.
“We are trying to establish a timeline of events. We are especially appealing to Mr Healy’s friends and colleagues to come forward. We also want to hear from anybody in the St Luke’s area who saw or heard anything suspicious,” said Supt Myers.