The Canadian Centre for Justice Statistics provides a fairly detailed report (“Homicide in Canada”, 2005 by Mia Dauvergne and Geoffrey Li.) about homicide clearance rates in Canada.
Some numbers are surprising. Others…not so much.
.... 24,000 homicides have been reported since 1961 (when the numbers first started being recorded)
....85% of homicides were solved by police (Who solved the other 15%??)
....Between 1976 and 2005, clearance rates were lowest in Quebec at 74%. (Are you surprised?)
....London, Greater Sudbury and Niagara Regional in Ontario reported the highest clearance rates--above 95%. (Good detective work or solvable cases?)
....Only 5% of homicides were solved a year or more after the date of incident. (Leads grow cold or law enforcement moves on?)
....Homicides committed by strangers … tended to take police longer to solve compared to homicides in which the accused person was known to the victim. On average, homicides committed by strangers were solved by police a little over four months after the date of the incident.
....In 2005, almost two-thirds (64%) of adults (18 years or older) accused of homicide had a Canadian criminal record. Among those adults with a criminal history, 62% had a prior conviction for a violent offence: 6 for homicide, 53 for robbery and 145 for another type of violent offence (such as assault). (Could Theresa’s murderer already be sitting in jail?)
....Most homicides are committed by lone accused; however, homicides committed by youth often involve more than one accused. Of the 51 incidents involving youth, more than half were committed by two or more individuals. Comparatively, of the 403 solved incidents committed solely by adults, 14% involved two or more accused. (Is this an avenue we need to explore—TWO suspects?)