Stevie is a character who appears in Season 4 of FtWD.
Nothing is known about Stevie's life prior to or as the outbreak began. It is possible she lived in or around the Austin area.
At some point in the apocalypse, Stevie came in contact with Clayton and decided to join his noble cause of helping other people by leaving boxes of supplies on the road.
Stevie is delivering a box at a mile marker when Martha approaches her. Martha corrects Stevie on a spelling mistake written on the box and Stevie corrects it. She thanks Martha for the help, but Martha says she doesn't. Stevie asks what she doesn't, and Martha repeats she doesn't help. Stevie is confused by the statement, as Martha stabs her through the throat, killing her.