María de la Cruz Olivier Obergh (1933 – 1984), known professionally as Maricruz Olivier, was a Mexican actress of film, television, and theater. She is best remembered for starring in the 1959 version of the telenovela Teresa, which was a success as it established her on-screen persona of playing villains.
"Ay, Maricruz" is a lovely Spanish song by Joaquín "Quinito" Valverde Sanjuán. It occurs in the movie Cria Cuervos as sung (hauntingly) by Imperio Argentina. (Her performance can be heard on YouTube.)