Woman arrested over death of fisherman who suffered head injuries in attack
Stefan Zait, 45, who was originally from Romania, was assaulted in Ardglass just before 11am on Tuesday and died two days later.
The 40-year-old woman was arrested on Thursday night and is being questioned by detectives.
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Hide AdA 20-year-old man who was arrested on Wednesday night remains in police custody.
A 23-year-old man was also detained in the wake of the incident but was subsequently released on bail pending further police inquiries.
Police Service of Northern Ireland Detective Chief Inspector Eamonn Corrigan said Mr Zait died from serious head injuries sustained during a "brutal and senseless attack" in broad daylight.
Officers are appealing for any witnesses, anyone with dashcam footage or anyone with any information to contact them.