SUDBURY, ON — Season 4 of CraveTV’s hit comedy series Letterkenny is now in production in Sudbury and is set to debut later this year, with a number of new guest stars scheduled to appear.CraveTV confirmed in a news release Tuesday that among this season’s guest stars will be Sarah Wayne Callies (The Walking Dead, Prison Break, Colony) and Jonathan Torrens (Trailer Park Boys, Mr. D). In addition, it was announced that Jacob Tierney will return to direct six all-new episodes this season while also reprising his role as Christian leader Glen.Season 4 brings new faces to Letterkenny, as outsiders...