Merah emerged from a bathroom, firing more than 30 shots at police as they burst into his apartment to end a standoff that had lasted more than 31 hours, Paris prosecutor Francois Molins said.
He jumped out a window, still firing wildly, and was found dead on the ground, Interior Minister Claude Gueant said.
Two police officers were injured in the raid, Gueant said.
Merah had only two bullets left in his gun when he was killed, Molins said.
Merah had reportedly trained with al Qaeda in Pakistan's tribal regions, though he claimed to have been working alone in his attacks.
[Image via AP]