“Bates Motel” killeth characters … and “Bates Motel” addeth characters. The A&E “Psycho” prequel has cast two more stars for its highly anticipated second season – and they will definitely be bringing more drama to White Pine Bay.

The latest scoop is that “Grey’s Anatomy” serial killer Michael O’Neill and Kathleen Robertson of the original “90210” will be joining “Bates Motel” for its sophomore season. Who will the two stars play?

O’Neill sounds like he won’t be straying too far from his role as the revenge-seeking shooter who stalked the halls of Seattle Grace. According to TV Line, the actor has booked a recurring role on “Bates Motel” as Nick – and he has a history with one of season one’s victims. It turns out that Nick is the father of Miss Watson (who met a grisly death at the hands of an insane Norman), and the grieving dad wants to “exact revenge on the perp responsible.” He’s described as a smart and “potentially ruthless charmer” … so Norman better watch out!

Robertson’s role, on the other hand, is a little more mysterious. The actress will be playing Jodi, a “smart” and “sexy” businesswoman and artist “who’s as hard-charging as she is successful.” Although TV Line is uncertain on how Robertson’s character will fit into the life of Norma and Norman Bates, she may have something to do with Caleb, Norma’s estranged brother.

As we previously reported, Caleb (“Sons Of Anarchy” star Kenny Johnson) will be a blast from the past for Norma when he shows up in White Pine bay to “coax his little sis into investing in a presumably shady business venture.” Could the business venture possibly be with Jodi?

Season two of “Bates Motel” is currently filming and set to air in 2014. Check out a full casting roundup below:

Christine (Rebecca Creskoff) – Norma’s first female friend, a member of White Pine Bay’s upper circle.

Caleb (Kenny Johnson) – Norma’s estranged brother who used to sexually assault her. Caleb will be showing up in town to hook Norma into a business venture.

George (Michael Vartan) – A charming divorcé who catches the attention of Norma.

Zane Carpenter (Michael Eklund) – An “upper-level player” in Dylan’s drug family.

Cody Brennan (Paloma Kwiatkowski) – A party girl who befriends Norman and shows him how to have fun and “act out.”

Nick (Michael O’Neill) – The father of deceased Miss Watson who is seeking revenge against her killer.

Jodi (Kathleen Robertson) – A smart and sexy businesswoman and artist.