A 52-year-old man arrested yesterday by detectives investigating the murder of Jim Donegan was later released unconditionally.
Mr Donegan (43) was shot dead outside St Mary's Christian Brothers' Grammar School in west Belfast in December.
The man was detained under the Terrorism Act following the search of a property in the Dunmurry area yesterday.
Items were also seized and taken away for examination.
Police later said he had been released unconditionally.
People arrested under The Terrorism Act must be charged, released pending report to the Public Prosecution Service or released unconditionally – bail is not permitted.
Detective Chief Inspector Pete Montgomery said: "Forty-three-year-old Jim was brutally murdered as he sat in his car outside a school on the Glen Road in west Belfast on 4 December 2018.
"I would continue to urge anyone who has any information, or who witnessed the murder, to contact the police."
