He announced that the party on Tuesday would hold funeral prayers in absentia for Morsi across Pakistan.
Amnesty International
Amnesty International urged Egyptian authorities to investigate the death of Morsi.
Magdalena Mughrabi, deputy director for the Middle East at Amnesty International, said Morsi's death "raises serious questions about his treatment in custody."
"We call on Egyptian authorities to conduct an impartial, thorough and transparent investigation into the circumstances of Mursi's death, including his solitary confinement and isolation from the outside world," the London-based rights group said in a twitter post.
It also called for an investigation into the medical care Morsi was receiving, and for anyone found responsible for mistreatment to be held accountable.
Human Rights Watch
Sarah Leah Whitson, executive director of Human Rights Watch's Middle East and North Africa division, called Morsi's death "terrible but entirely predictable", given the government's failure to allow him adequate medical care.
"What we have been documenting for the past several years is the fact that he has been in the worst conditions. Every time he appeared before the judge, he requested private medical care and medical treatment," Whitson told Al Jazeera.
"He was been deprived of adequate food and medicine. The Egyptian government had known very clearly about his declining medical state. He had lost a great deal of weight and had also fainted in court a number of times.
"He was kept in the solitary confinement with no access to television, email or any communication with friends and family," Whitson said, arguing that there would not be a credible independent investigation on Morsi's death "because their [Egyptian government] job and role is to absolve themselves of wrongdoing ever".
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