Then he drowned.
Well, biblically (from my understanding), the sea covered the Egyptian army--the chariot ranks and cavalry but not necessarily the Pharoah. I'm not pretending to know who was Pharoah around the time of the Exodus, but reading others' guesses is fun. From those who study what little is known of ancient Egypt, there are several different opinions on when Neferhotep I lived. I haven't found names of any archeologists, yet, who compare physical finds with biblical text (only mentions of "archeologists," so far). There are some "biblical historians" named, though. It appears that most (if not all) archeologists disagree with both biblical and secular historians to a great extent on dates.