He was in possession of the deathly hallows because the wand was his the cloak was his and then the stone was his. That is why he did not die. ... He cast a spell on Harry, intending to kill him but instead killed the seventh
Why did Harry Potter die?
Voldemort carried Harry's blood within him, and thus carried Lily's protection. He was a sort of tether that bound Harry to the real world. So when Voldemort “kills” Harry in DH, the piece of Voldemort's soul inside of Harry was killed for real (given that it was not protected by Lily's magic).
How did Harry die in Harry Potter?
Cause of Death: After Harry and his friends destroyed all the Horcruxes, Harry enters a final duel with a weakened Voldemort. Harry's disarming spell had the power to beat the Dark Wizard, in part, because Harry was the true owner of the powerful Elder Wand, which Voldemort was using.