Did Pharaoh die in the Red Sea or just his army?
"And the Egyptians pursued and went after them into the midst of the sea, all Pharaoh's horses, his chariots, and his horsemen. Now it came to pass, in the morning watch, that the LORD looked down upon the army of the Egyptians through the pillar of fire and cloud, and He troubled the army of the Egyptians. And He took off their chariot wheels, so that they drove them with difficulty; and the Egyptians said, "Let us flee from the face of Israel, for the LORD fights for them against the Egyptians." Then the LORD said to Moses, "Stretch out your hand over the sea, that the waters may come back upon the Egyptians, on their chariots, and on their horsemen." And Moses stretched out his hand over the sea; and when the morning appeared, the sea returned to its full depth, while the Egyptians were fleeing into it. So the LORD overthrew the Egyptians in the midst of the sea. Then the waters returned and covered the chariots, the horsemen, and all the army of Pharaoh that came into the sea after them. Not so much as one of them remained" (Exodus 14:23-28).
"He rebuked the Red Sea also, and it dried up; So He led them through the depths, As through the wilderness. He saved them from the hand of him who hated them, And redeemed them from the hand of the enemy. The waters covered their enemies; There was not one of them left" (Psalms 106:9-11).
"To Him who divided the Red Sea in two, For His mercy endures forever; And made Israel pass through the midst of it, For His mercy endures forever; But overthrew Pharaoh and his army in the Red Sea, For His mercy endures forever" (Psalms 136:13-15).
"You showed signs and wonders against Pharaoh, Against all his servants, And against all the people of his land. For You knew that they acted proudly against them. So You made a name for Yourself, as it is this day. And You divided the sea before them, So that they went through the midst of the sea on the dry land; And their persecutors You threw into the deep, As a stone into the mighty waters" (Nehemiah 9:10-11).
In most of the passages the emphasis is on the fact that Pharaoh's army was destroyed, but none specifically states that Pharaoh was with his army. Only in Psalms 136:15 do we find a specific statement that Pharaoh was destroyed with his army. Thus this particular Pharaoh did die in the Red Sea.