Does Hannah Die in Dexter?

Dexter sneaks on the yacht to save Hannah from Miles, but it turns out she already killed him by stabbing him with his eyeglasses.

What happened to Hannah McKay on Dexter?

During Hannah's arraignment, her friend Arlene slips her a substance that causes her to have a seizure. Hannah is taken to the hospital and escapes. Before disappearing, she leaves a black orchid on Dexter's doorstep.

Why did Dexter leave Hannah and Harrison?

Dexter Left Harrison To Protect Him From Himself

He realized there was no way he could provide Harrison with the life he ought to have or even proper safety. As tragic as Dexter's scenario is, he had to cut himself out of his son's life to ensure the best possible future for him.