As you all can tell... Romeo and Juliet have taken their own lives
Juliet and Friar Laurence make their way to the beach when Juliet decided to let Friar use his wind powers to put her in a temporary sleep. Friar agrees so starts to hum a song that puts Juliet to sleep instantly.
Romeo sees Juliet on the shore laying down so he comes out of the water to check on her, but he finds her "dead". Romeo doesn't know how he will ever live without his love so he decided to not go back into the water and to just lay there on the sand where he can dry out.
The Prince calls everyone over to the shore to give his speech about them and to discuss Romeo and Juliet's death and asks if anyone knows if there is a better explanation, but everyone is too sad to speak or does not know.