Toronto police say two deaths reported at a home in an upscale neighbourhood are being treated as suspicious.
Barry Sherman, founder of Apotex Inc., and his wife Honey have been found dead at their North York mansion.
Police said they learned of the deaths after responding to a midday (1700 GMT) medical call at the Sherman's home in an affluent section of northeast Toronto.
"The circumstances of their death appear suspicious and we are treating it that way", Hopkinson said.
Apotex, which called news of the Shermans' deaths "tragic", was recently implicated in a price-fixing scheme with 17 other drug companies and their subsidiaries.
Canadian Business magazine recently listed Barry Sherman as the 15th richest person in Canada, with a net worth of $4.77 billion.
Hopkinson would not confirm that the bodies are of Barry Sherman and his wife Honey Sherman.
According to BBC, Mr Sherman was the founder and chairman of pharmaceutical giant Apotex, which sells generic medicines around the world. "If it is determined to be a homicide, then our investigators from homicide will come in".
Sherman, who was 75, founded Apotex 43 years ago and remains privately held.
The Toronto Police homicide unit is collaborating with the investigation in case it ultimately takes over, he said. "As employees, we are proud of his tremendous accomplishments, honoured to have known him, and vow to carry on with the Apotex objective in his honour".
The deaths shocked the country, which knew the couple as ardent philanthropists who donated to universities, hospitals and charities. "Our condolences to their family & friends, and to everyone touched by their vision & spirit". She said that she last saw them two weeks ago, when they had an open house - and could not imagine anything like this happening to a pair she described as the "best neighbours" and the pride of the neighbourhood.
"I am gutted by the loss of Honey and Barry Sherman".
"I am beyond words right now", Ontario health minister Eric Hoskins said in a tweet.
Const. David Hopkinson, spokesperson for the Toronto Police Service, said police hope to receive the results of the autopsies later on Saturday. A very, very sad day.