In
Oedpius Rex, or
Oedipus the King, Jocasta was the wife of
Laius, the first King of
Thebes in the play, and both the
mother and the
wife of
Oedipus.
After finding out that the horrible prophecy of the Oracle had come true, Jocasta killed herself, and Oedipus blinded himself with the combs from her hair.
For more information on the myth, see Oedipus or Oedipus the King.