Guitar legend Gary Moore died of a suspected heart attack, according to a preliminary post-mortem examination.
Forensic experts believe the former Thin Lizzy star died from natural causes on Sunday (06Feb11), while on holiday in Spain with his girlfriend.
They will now conduct further tests on tissue samples before releasing a final report.
A Spanish police spokesperson says, "Mr Moore died of natural causes and his death is not in any way suspicious.
"An investigating magistrate has opened a standard inquiry to determine the exact cause of death."