Court documents from a sentencing in Toronto a decade ago detail Matthew Costain’s criminal record that began at the age of 14, arrests involving illegal guns and a history of issues with drugs.

Halifax Regional Police confirmed Friday that Matthew Costain, 39, who is the sole suspect in the double homicide, is the same Matthew Costain with an outstanding arrest warrant in Ontario.

Matthew Costain is shown in a Toronto Police Service handout photo released in 2019. Halifax police say the man suspected of killing a woman and her father on New Year's Eve was a fugitive wanted ...

Matthew Costain is shown in a Toronto Police Service handout photo released in 2019. Halifax police say the man suspected of killing a woman and her father on New Year's Eve was a fugitive wanted in ...

Investigators say Matthew Costain died of a self-inflicted gunshot wound a few hours after he shot and killed 40-year-old Cora-Lee Smith and her 73-year-old father, Bradford Downey, in a car in ...

Investigators say Matthew Costain died of a self-inflicted gunshot wound a few hours after he shot and killed 40-year-old Cora-Lee Smith and her 73-year-old father, Bradford Downey, in a car in ...

The latest deaths came on New Year’s Eve, as 39-year-old Matthew Costain allegedly shot and killed his girlfriend, 40-year-old Cora-Lee Smith, and her father, 73-year-old Bradford Downey ...