"Muhammed Morsi flailed on the courtroom floor for 20 minutes and the authorities did not help him. Morsi did not (die) naturally, he was killed", Erdogan said on Wednesday.
Morsi suffered a fatal heart attack following a court appearance Monday and now the Turkish leader has vowed his government "will do whatever it takes" to pursue prosecution of the current Egyptian government, whom he holds responsible for Morsi's untimely death, in worldwide court.
Foreign Ministry spokesman Ahmed Hafez denounced Colville comments as unacceptable as he tried "deliberately to politicize the natural death" of Morsi during his trial of espionage charges.
"Unfortunately, Mohamed Morsi was on the ground of courtroom flailing for 20 minutes".
Rupert Colville, a spokesman for the United Nations High Commissioner for Human Rights, called Tuesday for a "prompt, impartial, thorough and transparent investigation" into Morsi's death. "No official there intervened".More news: Samsung Galaxy Note 10 reportedly due August, losing headphone jack
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"He also appears to have been held in prolonged solitary confinement".
Morsi's Brotherhood has accused the government of "assassinating" him through years of poor prison conditions.
In the aftermath of his death, the OHCHR expressed concern over the conditions of Morsi's detention and the provision of necessary medical care, also urging for an independent investigation into the former Egyptian leader's death.
Another rights group, the Egyptian Initiative for Personal Rights, or EIPR, said Morsi died of "willful negligence".
Late on Monday, Egypt's chief prosecutor said Morsi's body would be examined to determine the cause of his death.