The Supernatural alum will officially share the screen with Justin Hartley in the new CBS series Tracker. Hartley shared the casting news on Thursday 25 April, revealing on Instagram that Ackles is set to play his character Colter's brother, Russell Shaw. "We finally came up with what I think is the perfect casting choice. This person knocks it out of the park every time.", Justin Hartley / Instagram. "We agreed to do this together, but apparently he's in the middle of something," he quipped as he panned the camera over to reveal Ackles playing an arcade game.