The Associated Press reports that homicide detectives are searching for a suspect in the murders of billionaire Barry Sherman and his wife in Toronto, Canada. Autopsy reports showed the cause of their death was "ligature neck compressions."

Sherman was a pharmaceutical mogul; he and his wife, Honey, were found in their mansion on Friday. There was no sign of forced entry into the house. The Sherman family urged authorities to launch a thorough investigation after confirming the cause of death.

Recently, the Canadian Business magazine estimated Sherman’s worth at $3.65 billion. This would make him the 15th richest person in Canada. However, Sherman had been known to drive older cars, and their home was considered modest for a billionaire.

Sherman founded Apotex, Inc. in 1974 in Toronto. He started with two employees and now has 11,000.

The couple was well-known for their philanthropic efforts, making donations to hospitals, schools and other charities in the multi-millions. The Shermans even hosted Prime Minister Justin Trudeau at a fundraiser in 2015 for the Liberal Party.

Honey also sat on the board for several non-profit agencies and groups such as the Mount Sinai’s Women’s Auxiliary, the Simon Wiesenthal Center and International American Joint Distribution Committee.

Sources report that Sherman had his fair share of controversy over the years, too. He was sued by family members alleging he had cut them out of the company profit over a period of years, but claims were dismissed by the judge.

Barry, 75, and Honey, 70, were discovered in their basement last Friday just after noon. 911 was called and police released their identities and causes of death on Sunday. They had recently listed their home for sale for $5.4 million, planning to move to a bigger property. Sherman, who is reportedly a workaholic, did not show up for work on Thursday, the day before their bodies were discovered.

*Photo credit STRINGER/Reuters