Barry Sherman, the Toronto pharmaceutical executive, and his wife, Honey, died from “ligature neck compression,” police said late Sunday. The case has been turned over to homicide investigators, according to a statement from the Toronto Police Service.

Ligature neck compression is strangulation caused by binding or tying. But police did not call it a homicide, saying only that the deaths of the couple, found in their mansion Friday, were “suspicious.” The two were hanging from a railing surrounding their basement lap pool, according to the Toronto Globe and Mail.

Sherman, 75, was the founder of the Canadian pharmaceutical company Apotex. Forbes estimated his net worth at $3.2 billion. The Shermans were well known as well for their philanthropy.

The Globe and Mail quoted a source saying that a real estate agent helping to sell the Sherman’s home discovered the bodies. The paper said there was no sign of forced entry and no note left behind.

Sherman founded the generic drug company in 1974.

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