An investigation into the mystery death of a man with mental health issues is underway after a coroner recorded an open verdict.
Christian Broom, 36, was found lying face down yards away from his front door in Park Road in January 2009.
Last week assistant deputy coroner, Howard McCann, recorded an open verdict at an inquest into his death.
The cause of death was established as 'mixed anti schizophrenic drug toxicity' - an overdose of his medication which included amisulphide, fluoxentine and olanzapine.
The Guardian understands there was no suicide note left and no previous indication that Mr Broom wanted to take his own life.
Lancashire Care Foundation Trust, which provides mental health services across the county, is looking into the case.
A spokesman said: "We can confirm that an internal investigation is underway after the death of a community mental health patient in January 2009.
"This was a very tragic incident and our thoughts are with the family and friends of the individual concerned.
"Investigations are ongoing into the circumstances surrounding the death and it would not be appropriate to discuss this in further detail until they have been completed."
Mr Broom was supported by the Lancashire Care Foundation Trust and Lancashire County Council who provide an integrated mental health service.
They give funding and commission private care providers to help people live independently in their own communities.
In Mr Broom's case, his care was provided by a Chorley-based company called SLC Paragon.
SLC Paragon is a supported living provider and part of the SLC Group which offers help to people with learning disability, physical disability and mental health needs, autism and challenging behaviour.
Charles Eggleston, chief executive of The SLC Group, said: "We are working in partnership with Lancashire County Council and Lancashire Care Foundation Trust to assist them with their investigation.
"The staff team who supported the individual have been devastated by the events and our thoughts go out to his family at this difficult time."
At the time of Mr Broom's death on January 5, 2009, there was a full-scale police response to the incident.
It was quickly established that there were no suspicious circumstances surrounding his death, but the chain of events which led to it still remains a mystery.
Mr Broom was living in his own home at the time of his death, receiving care from Paragon staff.
Due to the ongoing investigation, none of the agencies involved would comment on the frequency of Mr Broom's care.