[s5e9] Lies Of Omission -

Stiles killed Donovan in self-defense, but his guilt has kept him silent for weeks.

In a controversial move, Scott denies Liam’s plea to bite Hayden to save her life. He’s afraid the bite will kill her since she is already a "failed experiment". Parrish and the Nemeton Lydia and Parrish finally track down the Nemeton . [S5E9] Lies of Omission

While the pack falls apart, the continue their experiments, and things are looking grim for the Chimeras. Stiles killed Donovan in self-defense, but his guilt

Parrish has been subconsciously stealing the bodies of the failed Chimeras and taking them to the ancient stump. Stiles killed Donovan in self-defense

She is bleeding mercury, a sign that she is next on the Doctors' list.