This is the Cece and Wilden theory by Pretty Little Liars Latinoamerica
Cece has a picture with Wilden and Ali in Cape May so she knows him but... Why does she lie about it?
Some people talked about Cece and Wilden being BROTHERS. A lot of people think they are kindda simillar.
At Kanh's Cece said "I've seen cops do worse"... This would explain the conection between Ali, Wilden and Cece. Wilden had just graduated as a cop and Ali was only 14 so it's pretty hard to believe that Wilden went to her by himself, maybe Cece introduced them and that's how they ended up "together" and maybe that's why Cece denys knowing Wilden because she knows he was Ali's baby-daddy... Maybe that's also why she looks so suspicious.
What if she is working with Wilden and she was the one to crush the elevator when Jason was in it? I don't think Wilden and Cece are part of the -A team but they certanly have something to do with Ali's death.
Thanks for reading! Credits to Pretty Little Liars Latinoamerica
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.