Police in Lurgan have launched a murder investigation following the death of a 45-year-old man at a property in the Victoria Street area of the town.
Police were called to the scene shortly after 2.15pm on Sunday.
A 45-year-old man has been arrested at the scene and remains in police custody at this time.
The death is being investigated by detectives from the Serious Crime Branch.
In a statement, Detective Inspector Darren McCartney said:
"I am appealing for anyone with any information that can assist with the investigation to contact detectives in Lurgan on 101 quoting reference number 769 of 06/08/17. Information can also be passed anonymously via the independent charity Crimestoppers on 0800 555 111."
Upper Bann DUP MLA Carla Lockhart described the murder as "horrendous news".
"Local residents are in shock and the area is currently cordoned off with PSNI investigations ongoing.
"I would encourage anyone who has any information to come forward and report it to the PSNI on 101."