Police said the suspect was taken into custody yesterday, 24 hours after the murder inquiry into Stephen Butt’s death was launched.
Mr Butt, of Park Lane, Preesall, collapsed outside his home at around 6am on Sunday, August 18, after returning from a night out in Blackpool with his partner and her family.
He was taken to Blackpool Victoria Hospital but was pronounced dead a short time later.
It was initially believed the 50-year-old had collapsed through illness but as a result of further investigation officers now believe that he may have been assaulted before his collapse.
Det Supt Andy Murphy, who is leading the investigation, said: “The circumstances leading to Mr Butt’s death are still very unclear but we are of the mind at this stage that his death is suspicious and we are determined to establish exactly what happened.
“We believe that Mr Butt had been out with his group in Blackpool town centre pubs and bars in the early hours of Sunday morning, in particular,‘Hush’ and ‘Yates’. We know he made his way into the town centre at around 12.40am, spending several hours there, returning to Preesall between 5am and 6am.
“Not only am I looking to speak to anyone who was out in the town centre around those times that might have information, I am also keen to trace a private hire taxi driver who took the group back to the address in Preesall from Blackpool.
“The driver of the taxi would have picked up Stephen, a woman and another man from outside Hush nightclub between 3.30am and 5.am – I would appeal directly to the driver to come forward and contact us as they could have information crucial to the investigation.
“We are making a number of enquiries in both the Lancashire and Greater Manchester areas to try and trace people we believe may have information that could help so I would appeal to people in both counties to contact us if they have any information at all.”
Two women aged 50 and 25 from Manchester have been arrested on suspicion of perverting the course of justice and are currently in custody.
Anyone with information is asked contact police on 101 quoting log number LC-20130822-1126.