Two people have been arrested on suspicion of murder following the investigation into the murder of Darren Carley in 2002 been released after questioning by police.
The 50-year-old man from Gloucester and a 36-year-old woman from Worcester were arrested on Tuesday morning.
Human remains were found on farmland in Charnock Richard, Chorley, on 26th July 2002.
The identity of the man remained unknown for over 15 years but in 2017 advances in DNA allowed police to identify the body as Darren Carley.
Following the identification, a fresh appeal for information about Darren's murder was launched earlier this month.
Mr Carley went missing from his home in Swindon in January 2002, aged just 24.
The body was found nearly 200 miles from his home by a dog walker in a pond near the village of Chorley Richard.
A post mortem examination showed he died from his head injuries.
Detective Chief Inspector Geoff Hurst of Lancashire's Force Major investigation Team, said: "I'd like to thank those people who have already come forward with information.
"While these arrests mark a significant point in our investigation, I'd like to reiterate that our enquiries are ongoing. If you have any information at all about Darren, or his final movements, please let us know.
"Any information you have could be vital to our investigation and establishing exactly what happened to Darren."
Anyone with information should contact us on 101.