A Toronto man’s decision to end his life, simply because he felt it was time to die, has raised questions and concerns among family, friends and experts, some of whom say it could take the assisted suicide debate down a "slippery slope." John Alan Lee, a former professor of sociology at the University of Toronto, died in December. He had carefully planned his own death for months and discussed his decision with a CBC crew. "I can be satisfied," he told the CBC’s Duncan McCue when describing his life and the choice to end it. "I can say it’s been great. It’s enough."