What happened to max's mother on real steel?

In the film "Real Steel," Max's mother passes away before the events of the story, which deeply affects his character and his relationship with his father, Charlie. Her absence is a driving force for Max, as he navigates his feelings of loss and seeks connection with Charlie while also trying to bond with the robot boxing world. Her death is a pivotal part of Max's backstory, influencing his motivations throughout the film.