Ackles will appear in the episode slated to air May 12. Justin Hartley has tracked down who will play his onscreen brother. In a video posted to his Instagram thanking fans for watching his CBS drama series Tracker, he revealed that Jensen Ackles is joining the cast as a guest star to play the estranged brother of Hartley’s character, Colter …

The actor shares his teenage daughter Isabella Hartley with ex-wife Lindsay Korman-Hartley Justin Hartley has a built-in best friend through his daughter, Isabella Hartley. The actor, 47 — who stars in CBS’s new series Tracker, where he plays bounty-hunter-meets-private-eye — tells PEOPLE in this week’s issue that connecting with his 19-year-old, whom he shares with ex-wife Lindsay Korman-Hartley, is an …