Kieran Wilcox

Piper's Accomplice is the secondary antagonist of the MTV series, Scream. He or she is the accomplice to Piper Shaw, who was Ghostface whenever she couldn't be.

This person is heavily implied to be Audrey Jensen.

History
When Piper and Will go to the abandoned warehouse to meet with Mr. Maddox, they are attacked by Ghostface, who knows Piper down and drags Will off into the darkness.

In the season finale, it is revealed that Piper herself is Ghostface/The Lakewood Slasher. She tells her story and reveals to Emma that she has one last surprise they'll never see coming, before she is shot down.

In the ending of the episode, Noah remembers back to Piper and Will's attack and that Will confirmed Piper's story. This leads Noah to question who the other killer was. At this same time, Audrey burns letters from Piper.

Trivia

 * Piper's Accomplice is somewhat similar to Sara Harvey.
 * Sara is Red Coat whenever CeCe needed her to be, while the accomplice was Ghostface whenever Piper couldn't perform the duty.
 * It is never 100% stated whether this person is actually working for or against Piper. Though, it is implied to be for.