Police said they suspected that Hopley had brought him back.
After the manhunt was extended to the neighbouring province of Alberta, police found Hopley on Tuesday morning at a remote industrial site.
Kienan's father, Paul Hebert, told Canadian media: "We're happy for the community, relieved for the community."
Hopley has a string of criminal convictions and was jailed in 1985 for a sexual assault.
In 2008 he was imprisoned after breaking into a house in Sparwood and attempting to snatch a child.