Pop superstar Lady Gaga has reportedly obtained a restraining order after a disturbed fan wrote letters saying she would kill the singer and herself.  The fan, 26 year-old Anastasia Obukhova, wrote "I want to die and I want to die together with you. I am not [John Lennon killer] Mark Chapman. It is not only you who will die. I will shoot a bullet through my head, too," in the letter to Lady Gaga.  The woman has been ordered not to come within 500 yards of the star.