Her conviction rested in large part upon testimony from Smith , who concluded the boy had been strangled or smothered .
Tammy Marquardt was convicted in Ontario in 1995 of killing her two - year - old son , who had epilepsy .
Tammy Marquardt 's conviction rested in large part upon testimony from Smith , who concluded the boy had been strangled or smothered .
Tammy Marquardt was convicted in Ontario in 1995 of killing her two - year - old son , who had epilepsy .