The Toronto detective who cracked the case of "York U rapist" has revealed the major mistake the suspect made that eventually led to his arrest.

Toronto florist Felicia Hosany suffocated after her head was duct taped during a robbery in Toronto. Her husband's alibi was so good that police originally thought he was responsible for the violent crime. 

The double-murder suicide of tourists in Toronto put a popular hotel into lockdown. When the detective who solved the case arrived at the scene, he noticed peculiar clues in the hotel room that helped him crack the case.

Stefanie Rengel was stabbed to death because she was perceived as a love rival. The detective who investigated the case says the 14-year-old who orchestrated the killing left police stunned during her interview.

The murder of seven-year-old Katelynn Sampson was one of the worst a seasoned Toronto detective had ever seen. When he heard the 911 call from her guardian reporting the girl's death he immediately knew something didn't add up.

Nine-year-old Cecilia Zhang was taken from her Toronto home in the middle of the night. The detective who worked on the case suspected her parents were responsible for her murder until he sat down with them for an interview. 

Toronto girl Holly Jones was murdered by a stranger in 2003. The detective on the case said finding her killer was a needle-in-a-haystack investigation until two sharp-eyed officers made a breakthrough discovery.

Ontario doctor Elana Fric-Shamj was killed by her neurosurgeon husband. Police discovered her body stuffed in a suitcase in a river north of Toronto, but her killer left behind a crucial clue that led detectives right to his door.