COPENHAGEN, Nov 29 Danish architect Jorn Utzon, designer of the Sydney Opera House, has died of a heart attack at the age of 90, Danish media reported on Saturday.

Utzon was famous for the design of the Opera House, which was declared a Unesco World Heritage site last year, but he also designed the National Assembly of Kuwait and several buildings in his native Denmark.

In 1957 he unexpectedly won the competition to design the Sydney Opera House, but left the project in 1966, six years before the official opening of the building, after quarrels with the client and huge cost overruns.

In 2003, Utzon was awarded the Pritzker Prize, one of the world`s premier architecture prizes.—Reuters