Detective
Detectives hope to identify the victim, who suffered blunt trauma wounds to his skull.
Detectives believe the victim knew her attacker but no arrests have yet been made.
The journalist was shot in Londonderry last month.
This comes after detectives were granted an initial 36-hour extension on Friday.
The 35-year-old suspect has been held following a manhunt.
Her call comes as detectives probe death of 13-year-old Lucy McHugh.
Detectives trained to memorise faces are trawling CCTV footage.
Detectives are also trying to trace a sharp object found near Southampton Sports Centre.
More are expected in the coming weeks.
Tragedy left five people dead.