He was taken to the PACE custody suite at Musgrave Police Station where he was questioned by detectives.
Following questioning, the suspect was released on bail shortly before midnight on Friday pending further inquiries.
Last week, detectives seized a car in connection with her murder and also a kitchen knife which they believe was used to stab Ms McNally.
Meanwhile, a photograph of the late Ms McNally, who was 15 weeks pregnant at the time of her murder, will be shown on large screens at Goodison Park stadium today Saturday, January 14, during Everton’s Premier League home game against Southampton.
An image of the 32-year-old, who was stabbed to death in her Lurgan home on December 18, will be broadcast during half-time at the Premier League fixture.
Ms McNally supported Everton FC alongside her family, and the Liverpool club agreed to show her photo at the ground as a mark of respect.
“Her Image will be on the big screen before and at HT during the Southampton game.
“If anyone can take pictures of her on the screen and send them to me would be very much appreciated.”
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