Did Homer's Mum Die?

The episode features the death of Homer's mother, Mona Simpson. Homer is reunited with his mother, Mona, but is not willing to forgive her for all the times she left him as a child. When she dies, a guilt-ridden Homer attempts to make it up to her by fulfilling her final wishes.

How did Homer's mother die?

Homer attempts to break his mother out of prison on a prison bus, with a police chase ensuing. The chase ends when she apparently dies, after the bus drives off a cliff and into some water, where it explodes, which sets off a rock avalanche, burying the bus. Mona narrowly escapes the bus before it went off the cliff.

Where is Homer's mother?

Finding her sitting on an armchair, he apologizes, before realizing his mother is dead. Her death devastates Homer. She is cremated and, sometime after her cremation, the Simpson family watches her recorded will.