Percy killed Medusa at Aunty Em's Gnome Emporium after they ran from the bus.
percy
A greek god did not kill Medusa. She was killed by Perseus, a famous greek hero.
Medusa
Percy killed medusa in the lightening thief
From medusa
Medusa
Medusa in Percy Jackson, was in Aunt Em's shop. Medusa was olny mentioned in book one.
Medusa used to be Poseidon's girlfriend, so she kept Percy alive because she was still fond of Poseidon
The object inside the box under Percy's bed was Medusa's head that is why Percy's mom was freaking out.
Uma Thurman
Percy the lightning thief and clash of the titans..