Published Wednesday, 16 April 2014
Police released CCTV footage of Mr McManus' last moments. (© PSNI)
The 26-year-old victim died after being shot outside his workplace, a Domino's Pizza takeaway at the DC Enterprise Centre on Kennedy Way, on 30 March 2013.
The man, who was detained in Belfast, had been taken to Antrim Serious Crime Suite for questioning before his release.
Police recently issued a renewed appeal for information to coincide with the one-year anniversary of Mr McManus's killing.
The father-of-one was shot twice in the back, as three others looked on.
His killer got out of a maroon-coloured Vauxhall Astra car which was later found burnt out in Denewood Park off the Andersonstown Road.
Before Wednesday, only one person had been arrested in connection with the murder but was also released unconditionally.
© UTV News