Toro Muerto is the tertiary antagonist of The Book of Life.
Toro Muerto is all the bulls that all the Sánchez family bullfighters have ever killed in bullfighting merged into one giant monster skeleton bull. It was first encountered by Manolo Sánchez as his challenge for coming back to life. However, Manolo refuses to harm it and instead subdues it using quick thinking and plays a heartfelt apology song to the Skull Bull in which he is apologizing for all the bulls the Sanchez family bullfighters have ever killed and wronged in bullfighting.
Now soothed by Manolo's song, Toro Muerto is able to rest in peace and it’s body ends up turning into cempasuchil marigold flower petals and ashes which disappear into a white light above.
- Toro Muerto literally means "Dead Bull" in Spanish.