The one who helped Ali kill Courtney is Ali's helper [aka A.] in "Crushed" because in "APLL" he/she said "Of course I made it, I will be always there for you" or something like this
When Emily and Iris break in the Maxwell´s house, they find an old mobile phone in the room they think was Tripp´s. It has a picture of Alison on it. Iris thinks that this is the proof that Tripp had never really loved her, but that he had been in love with Alison. But mayby that room belonged to Nick, who could be Tripp´s brother, and then it could be Nick´s phone, which would obviously have a picture of his girlfriend (Alison) on it.
In my eyes that´s just another clue that Nick had helped Ali kill her sister Courtney and that he´s still Alisons helper.
I'm confused though. In Crushed, Iris sees Noel Kahn at Prom and says that that was Real Ali's boyfriend. And in Burned, Noel says he loved Ali. And we alreaedy know he's a little unstable because he pinned down Aria to just try and explain. Though... I suppose nothing is ever as it seems in Rosewood. Hannah thought that Graham was trying to say that Real Ali dated Noel as he died... but we only heard "N", so it could very well be Nick.
My theory is that Ali was dating Noel while at the Preserve. She somehow conned him into her little game of revenge. But, since Nick's last name is Maxwell, similar to Tripp's, I believe that it's possible that Nick came to visit Tripp (brother? cousin?) at the hospital, but snuck off to somewhere else in the hospital to be with Ali romantically. Since it's possible that they had a relationship, Ali also convinced him to act in revenge. It's very possible that Tripp is Reefer Fredricks too, so since they were friends (possibly more on the grounds that Ali had said he was her boyfriend and tutor at the reserve and the pic of Ali on his phone). She also convinced him to act in revenge. He might have actually spiked the weed he gave to Spencer, even though he denied it. One might question why Tripp Maxwell and Reefer Fredricks have different last names? Well, since we find out in "Crushed" that Tripp's parents are divorced and that his mom kicked him out, he could have had the last name Maxwell (his moms?) when he lived with his mom and then decided to use the last name Fredricks (his dads?) and the nickname Reefer to throw off Spencer when he dated her. It would make some sense, for all three of these boys dated people that Real Ali wanted revenge on. It's probably not a strange coincidence, for Shepard never uses coincidences in this series.
My theory is that Nick is Tripp! I believe that "Nick" was just using aname other then his own since Courtney knew that Ali was dating Tripp. The real Ali didnt mention Nicks name in her diary which makes me believe that he made up the camping story. he then said his ex girlfriend was a psycho.
It couldn't have been a male, because if you read the summary of: "Pretty Little Liars:Ali's Pretty Little Lies", it says "Then she and Ali buried Courtney"
Also, in the first book, Spencer and Wren smoke outside. It could have been Spencer
Yea, read "Deadly" You'llsee in he end hw Ali said "Only the strong survive." And then she tured him in to the cops and framed him for the murder of Tabitha. The only wayse could frame him was she hd taken a video of him beaing/blugending her in her head. So yea ~SO CONFUSING~
Well i have tons of suspects in the murder of Courtney Dilaurentis
1. Jenna Cavanaugh 2. Jason Dilaurentis 3. Ian Thomas 4. Nick Maxwell 5. Jason DiLaurentis 6. Tabitha Clark 7. Noel Kahn 8. Melissa Hastngs 9. Iris Taylor 10. Darren Wlden
I know Jenna, Ian, and Melissa are most likely not the killers but keep them in the back of your minds.
It is Nick! they reveal it in the books, hint in Alis lies and say it on pll wikipedia