Barry Sherman, the billionaire founder of Canadian generic-drug company Apotex, and his wife, philanthropist Honey Sherman, were found dead Friday at their Toronto home. He was 75 and she was 70. Police said both died from ligature neck compression and classified the deaths as suspicious. Homicide detectives took over the investigation, but police had not determined whether foul play was involved.

The couple’s bodies were found hanging near their indoor pool, reportedly by a real estate agent who was helping sell the home. Police said there were no signs of forced entry and no outstanding suspects of concern to the public. Some news outlets cited police sources who said investigators were considering a murder-suicide theory. The Shermans’ four adult children rejected that suggestion, saying it was inconsistent with their parents’ enthusiasm for life and commitment to family and community.

Friends were stunned by the deaths. Less than a week earlier, Honey had emailed friends about the couple’s upcoming trip to Florida and was arranging social gatherings there. A business associate who had recently spoken with Barry said he remained enthusiastic about his work and had no plans to leave Apotex.

Barry founded Apotex in 1974 and built it into a major international supplier of generic medicines. Canadian Business recently estimated his wealth at $4.77 billion. Friends and colleagues remembered him as reserved, tireless and devoted to his company. Toronto Mayor John Tory credited him with creating jobs and maintaining manufacturing operations in the city.

Honey was remembered as warm, outgoing and determined in her charitable work. The couple donated millions to hospitals, universities and Jewish community causes. She served on the boards of organizations including York University, the Baycrest Foundation and Mount Sinai Hospital, and held leadership roles in Jewish philanthropic and educational groups. Neighbours, employees and well-wishers left flowers outside the couple’s home as tributes came from political leaders, friends and colleagues.