10 people killed and 19 were injured.
Damien Sanderson was found dead on Monday with "visible injuries" on a farm near the stabbing sites.
Miles Sanderson has been taken into custody.
Police had been looking for Miles Sanderson since May, with officers launching a multi-day search operation for Sanderson on Sunday.
According to the CBC, Miles Sanderson was placed on parole after serving a federal sentence of nearly five years for assault, robbery, mischief and intimidation.
The Melfort RCMP has canceled its Dangerous Persons Alert on the arrest of Miles Sanderson, saying the public is no longer at risk.