The 25-year-old actor signed up to The CW reboot as Jasper Herman, the nephew of the man that Annie (Shenae Grimes) murdered on the season finale, E! reports.
Grimes revealed that the cast addition will integrate himself into the popular crowd of West Beverly High on the show, though he isn't who he appears to be.
She said: "My gut instinct is that he may [know I killed his uncle], but Annie hasn't told anybody. It's definitely a secret right now."
She added: "He's totally that Christian Slater in Heathers kind of vibe - that creepy older dude who you just can't take your eyes off of. I have a bad feeling in my gut, and I think he's going to take Annie for a little bit of a spin.
"She thinks she finds love and that may screw her up a little more."
It was recently reported that AnnaLynne McCord (Naomi Clark) said that she wanted her two sisters to land cameo appearances on the popular teen drama.
90210 returns Tuesday, September 8 on The CW.