A 33-year-old man and a 27-year-old woman, arrested in connection with the death of Adam Krzan last week, have been released on bail pending further police inquiries.
Mr Krzan, 71, was found with serious injuries following an assault at a flat in Corrainey Park, in Dungannon, County Tyrone, on the evening of 27 February.
Emergency services were sent to the incident in the Lisnahull Estate but he died at the scene.
A 30-year-old man, arrested in connection with the death of Mr Krzan, was released from custody unconditionally on Wednesday.