Vintage car lover Eugene Gillespie, 67, was attacked and beaten in his home in the town’s Old Market St. He was left to die with his hands tied behind his back.
Gardaí believe he was left for up to 48 hours before he was discovered on Friday night. The house where he lived was less than 80m from Sligo Garda Station.
Gardaí believe the robbery and assault could have happened anytime between 9pm on Wednesday and 9pm last Friday.
The death has similarities with the 1998 death of 83-year-old Eddie Fitzmaurice in Bellaghy, on the Sligo/Mayo border.
Gardaí made a fresh appeal this year on the 14th anniversary of Mr Fitzmaurice’s death. He was assaulted, tied up, gagged, and left to die. It was five days before a neighbour found the body. Nobody was ever charged over his killing.
Gardaí are appealing for anyone who noticed anything unusual or suspicious in the area between 9pm on Wednesday and 9pm on Friday to contact them on 071 9157000, the Garda Confidential Telephone Line on 1800 666111 or any Garda station.
Meanwhile, gardaí have released three men they had been questioning in connection with a terrifying attack on the home of an elderly woman and her family.
The 80-year-old was at home with her middle-aged son and daughter in Kilmu-rry McMahon in west Clare on Friday when three men wearing balaclavas approached at about 9pm.
The men smashed a window and a glass panel door. They threatened the occupants with a knife through the smashed window and demanded cash. They fled after a small amount of cash was handed over.