"Morsi was struggling on the floor in the courtroom for 20 minutes".
Morsi died while appearing in court on spying charges.
Egypt said Wednesday that the United Nations human rights office was trying to politicize the death of former Egyptian president Mohammed Morsi, who collapsed inside a Cairo courtroom during his trial this week.
Turkish President Recep Tayyip Erdogan was a close ally of Morsi during his short tenure as president, and one of the fiercest worldwide critics of the coup that toppled him.
"Unfortunately, Mohammed Morsi was on the ground of courtroom flailing for 20 minutes".
He also called on the Islamic Cooperation Organisation to "take the necessary action" over Morsi's death.
"Any sudden death in custody must be followed by a prompt, impartial, thorough and transparent investigation carried out by an independent body to clarify the cause of death", said Colville.
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"Concerns have been raised regarding the conditions of Mr Morsi's detention, including access to adequate medical care, as well as sufficient access to his lawyers and family", Colville added.
His death "is an opportunity to shed light on the health conditions inside Egyptian prisons, particularly prisons housing activists and political detainees", EIPR said.
Morsi was toppled by then army chief, now President Abdel Fattah al-Sisi in 2013 after a single divisive year in power.
El-Sissi has yet to comment on Morsi's death.
He said he condemned in the "strongest possible terms" the request from the spokesperson for the UN High Commissioner for Human Rights, Rupert Colville, made on Tuesday.
Erdogan's AK Party supported Morsi's short-lived Egyptian government, and many Brotherhood members and supporters have fled to Turkey since its activities were banned in Egypt.
Egypt's government has dismissed accusations that the former president was badly treated.