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Could Detective Wilden (Bryce Johnson) have killed Alison (Sasha Pieterse) on Pretty Little Liars? After Season 3, Episode 17: “Out of the Frying Pan, Into the Inferno,” it's a possibility that every PLL fan must be considering.

While the hint that Wilden may have been Ali's baby-daddy is what set us speculating down this path again, it's hardly the only reason to find Wilden suspicious. Here are 5 other reasons we're keeping our eye on him.

His little speech about having killed someone. After Episode 17, the man is a professed killer. Yes, he claimed his case was self defense, but this show isn't called Pretty Little LIARS for nothing. Plus, if he did kill Ali because she was pregnant with his child, he could probably rationalize to himself that it was a defense of his reputation, or something else equally twisted and wrong.

Garrett. It seems clear that Garrett (Yani Gellman) was killed for knowing too much, probably about the night Ali died (possibly also about the "A" team). We assumed he was involved because of the N.A.T. club, but could his death actually be because, as one of Wilden's co-workers on the force, he learned something he shouldn't have about the detective?

He's willing to bend the rules. We've known since Wilden practically blackmailed Ashley Marin (Laura Leighton) into sleeping with him that the man is morally, ah, flexible, to say the least.

He's been around since the beginning. Speaking of things that happened in Season 1, the fact that Wilden has been around since the beginning of the show makes him a prime suspect on a storytelling level, because it would tie things together nicely.

His obsession with the case, and the Liars. Yeah, yeah, he's a detective who wants answers. We don't think that quite explains Wilden's intense obsession with this case, or his conviction that the Liars are guilty. Maybe he's dedicated to pinning Ali's murder on the girls to protect himself.

Plus, the man is plain creepy. At this point we wouldn't put anything past him, and he's certainly a major suspect when it comes to Ali's pregnancy. But could he be guilty of murder? Share your thoughts in the comments below!

Catch the next episode of Pretty Little Liars on Tuesday, February 5, 2013 at 8 p.m. ET/PT on ABC Family.

Rebecca Martin is an editor at Wetpaint Entertainment. Follow her on Twitter @BeccaDMartin.