Published Thursday, 01 November 2012
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The man was detained in the greater Belfast area after police moved their investigation to the Antrim area.
He was bailed on Thursday pending further police inquiries.
Mr Acheson, 72, suffered a heart attack after he confronted a robber at his Glenmore Gardens home in the early hours of Monday 30 April.
The intruder stole a purse from his 70-year-old disabled wife, before making off with £375.
Mrs Acheson raised the alarm but by the time ambulance personnel and police arrived her husband was dead.
Detective Chief Inspector Ian Harrison, in charge of the investigation, had said that police have been trawling through footage from more than 80 CCTV systems.
They have also visited 240 houses and taken 200 statements from members of the public.
Crimestoppers is offering a £10,000 reward for information leading to the arrest and conviction of the man responsible for Bertie's murder.
A property in the Antrim area was also searched on Wednesday.