Detectives from the Major Investigation Team have launched a murder probe following the death of 75-year-old Daniel Guyler.
Mr Guyler was found with serious injuries in the Termon Street area of Derry on Monday, July 23, 2018, police say.
He later died in hospital.
Detective Inspector Ray Phelan said: “Following extensive police investigations detectives have today, Wednesday, July 22, arrested two women aged 33 and 44 on suspicion of murder.
“They have been taken to Musgrave PSNI Serious Crime Suite for questioning.”
“I realise this incident occurred some time ago, however I would ask people to cast their minds back to Monday, July 23 2018.
"Mr Guyler was found injured at approximately 8.45pm, were you in the area before or after he was found?
"If you were I would appeal to you to contact detectives on the non-emergency number 101 quoting reference 1317 23/07/18.
"Alternatively, information can also be provided to the independent charity Crimestoppers on 0800 555 111, which is 100% anonymous."
