Alison's Attempted Killer

Alison's Attempted killer is the anonymous character in Pretty Little Liars who attempted to kill Alison DiLaurentis by burying her alive during the Liars' sleepover on September 1, 2009. We still do not know whose body was found in the "Pilot", but we'll find new informations in the "Who's In The Box?" episode.

Suspects

 * Darren Wilden (Deceased)
 * Melissa Hastings
 * CeCe Drake
 * Ezra Fitz
 * A|"A"
 * Board Shorts
 * Wren Kingston
 * Paige McCullers (Cleared)
 * Jenna Marshall (Cleared)
 * Toby Cavanaugh (Cleared)
 * Ian Thomas (Deceased & Cleared)
 * Jason DiLaurentis
 * Garrett Reynolds (Deceased & Cleared)
 * Mona Vanderwaal
 * Lucas Gottesman
 * Spencer Hastings (with Alison before she died)

Speculations
The Liars first suspect Toby Cavanaugh because Alison was wearing his sweater on the night she died. They thought that Toby was Alison's secret boyfriend, and that he killed her. They later clear him because of him admitting to Emily that his tattoo, '901 Free at Last', was the day that he was free from his forced relationship with Jenna, rather than the day Alison was killed.

Ezra Fitz is currently the new suspect of Alison's attempted killer. We know Ali was seeing an older boy shortly before she "died". He is seen in A's main lair at the end of "Now You See Me, Now You Don't." He is implied to be Board Shorts.