Detectives investigating the 31-year-old’s killing which happened in Lurgan’s Victoria Street last April arrested the man this morning.
Ms Marshall’s body was discovered at her flat on Sunday 3 April 2016.
Detective Chief Inspector Eamonn Corrigan, from Serious Crime Branch, said: “The suspect was interviewed today and subsequently released pending a report being submitted to the Public Prosecution Service.”
A 36-year-old man has been charged with Laura’s murder and appeared at Craigavon Magistrates Court on Friday 8 April.
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He is Gary O’Dowd (36) from Knocknagore Road in Gilford.
He was later released on bail.