ISTANBUL - The remains of former Turkish President Turgut Ozal are to be exhumed from his grave in Istanbul on Tuesday on the orders of prosecutors investigating suspicions of foul play in his death 19 years ago.

After Ozal's death, relatives and associates said he was poisoned, and forensic teams will investigate whether any poisonous substances are present in the remains.

Ozal, the eighth president of the Turkish Republic, died of heart failure in April 1993 in an Ankara hospital at the age of 65 and while in office.

Prosecutors decided two weeks ago that Ozal's remains should be exhumed and another autopsy held after a state supervisory board, acting on the order of President Abdullah Gul, produced a report in June voicing suspicions about the death.

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