Police in the North are investigating the death of a man whose body was found in the Bayview area of Derry city.
Police were called to a flat in Bayview Terrace at around 1am, where they discovered the body of one man and a second man with serious injuries.
Detectives say initial inquiries suggest there had been an assault.
The injured man was taken to Altnagelvin Hosptial in Derry before being transferred to the Royal Victoria Hospital in Belfast, where he is said to be in a critical condition.
The PSNI say one man has been arrested in connection with the investigation and the area around the Bayview Terrace Road has been closed.