Draco has dead because of the chandelier fell where he stood, Harry was shocked when he saw it. He couldn't eat or sleep for many days, then Harry saw the time turner and he used this to travel back to the past, when Draco still alive

But when Harry used time turner, it created a curse, make Draco has to die for many ways even if Harry tried to save him

"Malfoy, I would save you this time...this time..and this time.."

Harry thinks to himself while turn on the time turner once again.