Ammeline Hamstring, also known as 'Goodie' Hamstring was a witch from Lancre, the Ramtops. She appeared only in Mort, and was Mort's first "collection" as Death's apprentice. She had a grey cat.

As with all Discworld magical practitioners, she knew in advance when her death would be and again would be personally visited by Death (or had a right to be anyway) so she had time to prepare.

When Mort arrived she was an elderly lady with a hooked nose wearing a grey woollen dress. After Mort cut the line connecting her soul to her body, she realised it was no longer bound by the body's morphic field, and with much more control than most people her soul's form settled into the shape of her "inner self". Her hair unwound itself from its tight bun, changing colour and lengthening, her body straightened up. Wrinkles dwindled and vanished, and her dress turned into something green and clingy.

Rather than go on to an afterlife, she remained at her home, intending her spirit to get thinner and spread through the forest.