Because Spencer put together all the clues that Mona had accidentaly given to the girls.
Hanna, Emily, Spencer, Aria, and Alison are the girls on Pretty Little Liars
Aria, Hanna, Spencer, and Emily.
Yes she did, she told Spencer the night she died.
Aria, Hanna, Spencer, and Emily.
It is alison
The girls on the cover of the Pretty Little Liars series are Hanna, Aria, Spencer, Emily and i think Alison is on one of them.
Ian isn't A, Courtney who is Alison's twin was murdered by Alison ..Mona is -A but after Mona dies and tries to kill Spencer ; Ali becomes -A to mess with the Pretty Little Liars.
No, Spencer from Pretty Little Liars does not die.
they kill alison..or so they thought
Ian, who is Spencer's sister Mellisa's husband, kills her.
The girls find out that Alison was seeing Ian, but he isn't Spencer's ex, he is Spencer's sister, Melissa's ex, who Spencer had also shared a kiss with.
Episode 1 or 2 I believe of season 1.