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Egypt's first popularly elected president, Mohamed Morsi, was buried early Tuesday in the presence of only his family members and lawyers, said a source with his legal team.

The former leader, who died Monday during a court session, was buried at 5 a.m. (0300GMT) local time in Nasr City, east of Cairo amid tight security, according to the source, who spoke on condition of anonymity.

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Egypt's ex-President Morsi dies during trial

BRUSSELS, BELGIUM - (ARCHIVE) : A file photo dated September 13, 2012 shows Ousted Egyptian President Mohamed Morsi (L) and former President of the European Commission, Jose Manuel Barroso (R) during their joint press conference in Brussels, Belgium. Egypt’s first democratically-elected president, Mohamed Morsi, 67, died Monday during a court trial on espionage charges. ( Dursun Aydemir - Anadolu Agency )

A leaked document on social media purportedly said that the funeral attendees were Morsi's brother, son, wife and two lawyers. Anadolu Agency could not independently verify the authenticity of the document.

Earlier, Egyptian authorities rejected a request by Morsi’s family to bury him in his hometown in Sharqia Province, his son, Abdullah Mohamed Morsi, told Reuters on Monday.

The country's state television reported early Tuesday that Morsi was "suffering from a benign tumor, had continuous medical attention and his death was caused by a heart attack".

Earlier Monday, Egypt's public prosecutor Nabil Sadek said the 67-year-old leader collapsed in the defendants' cage and was immediately rushed to the hospital, where he was pronounced dead.

There were no marks from injuries on his body, Sadek said.

A leading member of Egypt's Muslim Brotherhood group, Morsi won Egypt's first free presidential election in 2012.

After only one year in office, however, he was ousted and imprisoned in a bloody military coup led by Egypt's then defense minister and current president Abdel Fattah el-Sisi.

At the time of his death, Morsi faced a host of legal charges, which he, along with numerous human rights groups and independent observers, said were politically motivated.

According to his family, Morsi had diabetes and kidney disease and had not been provided proper medical treatment.

Amnesty International said that during his six-year sentence, he was cut off from the outside world and allowed only three family visits. He was also prevented from access to his lawyers or a doctor, said the rights body.

Human Rights Watch called for an international investigation by the UN into the death of the late leader. It said earlier that the news of his death was "terrible but entirely predictable" due to inadequate medical care.

The Muslim Brotherhood previously called on the UN to push for adequate medical treatment for the ex-president, citing his neglect while detained, according to London-based online news outlet Middle East Eye.

Turkey became the first country to react to Morsi’s death, with President Recep Tayyip Erdogan calling him "a martyr who died struggling for his cause" and saying that history will never forget the tyrants who caused his martyrdom.

In a statement, Turkey’s Foreign Ministry said Morsi will be remembered as "an exceptional person in his country's struggle for democracy".

Funeral prayers in absentia will be held in mosques across Turkey on Tuesday for Morsi.

Qatari Emir Sheikh Hamad bin Khalifa Al Thani also mourned Morsi and offered condolences to his family and the Egyptian people.

In a statement, the Muslim Brotherhood called Morsi’s death a "deliberate killing" and blamed the Egyptian government for placing him in solitary confinement and depriving him of medical treatment.

Since Morsi’s ouster, Egypt’s post-coup authorities have waged a relentless crackdown on dissent, killing hundreds of the former president’s supporters and throwing thousands in jail on “violence” charges.

Shortly after the coup, Morsi’s party, the Muslim Brotherhood, was officially designated a “terrorist organization” in Egypt.

*Erdogan Çagatay Zontur in Ankara contributed to this story