Kavous Seyed-Emami was managing director of the Persian Wildlife Heritage Foundation, which seeks to protect Iran´s rare animals, and a United States -trained scholar in sociology. "I still can't believe this", Ramin, a well-known singer, said. "On his Instagram account, Raam Emami wrote that authorities said his father had committed suicide".
The Canadian Foreign Ministry told CNN: "We are aware of these reports".
One of Iran's most eminent professors, Kavous Seyed-Emami, has died in custody after his arrest in a crackdown on dissent.
He added that the family have asked for an independent postmortem examination.
On Saturday, Jafari-Dolatabadi said Iran's security forces had arrested several people who had been "gathering classified information in strategic areas. under the coverage of scientific and environmental projects". Seyed-Emami had said he felt it was his duty to teach his opposing views.
A leading opposition politician in Iran, Mostafa Tajzadeh, referred to other recent deaths in prisons which he wants investigated and said that President Hassan Rouhani "must do the same until the real reasons of the death of Dr. Sayed Emami is clear to public".
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He also adds his time at Manchester United was a success and states the fact that he scored and won in the Europa League Final.
The Iran Sociology Association, of which Mr Emami was an active member, released a statement on Sunday questioning the claim that he took his own life.
Seyed Emami was one of the founders of the Persian Wildlife Heritage Foundation, an Iran-based environmentalist group.
The Center for Human Rights in Iran (CHRI), a non-profit group based in NY, said at least nine other staff members and executives of Seyed-Emami's organisation had been arrested on the same day as him, citing a relative of one of those detained.
Mr Emami's friend and former sociology colleague at the University of Lethbridge said his death was a "profound tragedy".
Iranian lawmaker Ali Shakourirad, head of the reformist Islamic Union Party, called on justice officials in a tweet to be more transparent, saying that the death had "caused a wave of questions and concerns among the public".
Another member of the environmentalist group detained in Iran last month was Morad Tahbaz, who has dual Iranian-US citizenship.