Billionaires Barry and Honey Sherman were killed inside their Toronto mansion in December 2017. The case remains unsolved more than three years later. (United Jewish Appeal/The Canadian Press)

The causes of death were determined to be ligature neck compressions, a type of strangulation.

It's been estimated the Shermans were worth anywhere from $5 billion to $10 billion.

https://www.cbc.ca/news/canada/toronto/barry-honey-sherman-murder-2021-1.5860527