Initial post-mortem results have indicated that Belfast-born musician Gary Moore died from a heart attack.
The former Thin Lizzy and Skid Row guitarist died early on Sunday, hours after arriving at a hotel in the Costa Del Sol.
Spanish police said although toxicology tests on bodily fluids are still to be completed, at this stage they are not treating death as suspicious.
A judge is expected to authorise the release of the body to the family soon.
The Northern Ireland guitarist was only 16 when he moved from Belfast to Dublin in 1969, to join Skid Row, which featured Phil Lynott as lead vocalist.
He was later brought into Thin Lizzy by frontman Lynott to replace the departing Eric Bell, another guitarist from Northern Ireland.
Moore also gained acclaim for his solo work and performed on stage with a range of major artists and released 20 studio albums.
On Monday, Bob Geldof said Moore was "without question, one of the great Irish bluesmen".
"His playing was exceptional and beautiful. We won't see his like again," he said.