Who tries to wake Juliet and cries out that she is dead?Shakespeare; Romeo and Juliet
At the very beginning of Act IV, scene v, it is the Nurse who tries to wake Juliet and first cries out that she is "dead." Of course, she isn't dead; she is merely under the effects of the potion given to her by Friar Lawrence.
It is this scene, however, that provides us with a great example of dramatic irony in the play. Although the audience is completely aware of what is transpiring, none of the other characters are. And so much like the Nurse, both Lady and Lord Capulet both come into Juliet's chamber to cry over the same discovery.
It is Juliet's nurse who does this. She goes in to wake Juliet because this is going to be the day that Juliet marries Paris. But when she gets into Juliet's room, she finds that Juliet is (or so it seems) dead. She teases her about being lazy and such, but then she gradually comes to realize that Juliet is not just asleep.
At that point, the Capulet household is plunged into mourning. Instead of celebrating a wedding, they are mourning yet another death in their extended family.
You can find this in Act IV, Scene 5.