In freak the mighty what do you learn about Max's mom

In Freak the Mighty, I did learn that Max's mom was killed.

Explanation:

As it turns out, Iggy is a friend of Max's father, Killer Kenny Kane, who is soon to be released from prison. For, it is not long afterwards that Marx finds a large hand on his face one night, and he is kidnapped. Back at the tenements, Kane ties up Max, who learns that the police are looking for his father. While he is gone, Loretta comes to untie Max, but Kenny returns too soon. He begins to strangle Loretta, and Max tries to stop him, even though he knows "no one can stop him." Unable to get Killer Kane to stop, Max screams out,

"I saw you kill Mom ... I saw you do it! You killed her and I'll never forget, not ever!"

Max was four and his father killed Annie, his wife, in the same manner that he tries to murder Loretto. After hearing Max, Kenny tries to then choke Max until little Freak comes and shoots from a squirt gun, vinegar and curry into Kenny's eyes.