Police have named the 63-year-old man who was murdered at a residential property in Portadown as Stephen Barriskill.
Major Investigation Team detectives have issued a photograph of Mr Barriskill, along with a further appeal for information.
Detective Chief Inspector McGuinness said: “Just after 12.07pm on Wednesday afternoon (27 October), police responding to the report of an incident, located the body of Mr Barriskill at a residential property in the Whitesides Hill area of Portadown.
“A man arrested on suspicion of murder on Wednesday remains in custody.
“While our investigation is ongoing, I would again appeal to anyone who was in the Whitesides Hill area from 8pm on Tuesday 26 Oct, and who witnessed anything suspicious to contact Detectives on 101 quoting reference 773 of 27/10/21.