Canadian homicide detectives have taken the lead in investigating the mysterious deaths of pharmaceuticals billionaire Barry Sherman and his wife Honey, a day after relatives complained about the handling of the case.
The development does not mean the deaths are being treated as homicides, Toronto Police Service spokeswoman Michelle Flannery said.
The couple, who were celebrated for their philanthropy and financial success, were found dead in their Toronto home on Friday (local time), reportedly by a real estate agent involved with selling the property.
Police have said there was no sign of forced entry to the home, which is listed for sale at $C6.9 million ($7 million).
Autopsies conducted on Saturday and Sunday determined that the couple died from ligature neck compression.
Police asked anybody with information on the case to contact authorities.
The case has dominated the Canadian news, with employees, friends and leading politicians expressing shock.
The Globe and Mail, Toronto Sun and Toronto Star reported that police were operating on the theory that Mr Sherman had killed his wife and then taken his own life.
A statement issued late on Saturday on behalf of the Shermans' four children criticised that idea, and said they did not believe it was true.
Ms Flannery would not say whether police were looking for a suspect.
Police had said on Saturday they had nobody in custody and were not seeking any suspects.
Mr Sherman founded Apotex Inc in 1974 and built it into one of the world's biggest generic drug makers, making him one of Canada's richest people.