Alison is a character mentioned in Fear The Walking Dead. She was the girlfriend of Jack for three years until her death.
Pre-Apocalypse
Nothing is known about Alison's life before the outbreak, except that she was dating Jack for at least three years.
Post-Apocalypse
Season 2
"Monster"
Alison is mentioned by Jack as he discusses his life with Alicia over the radio. He mentioned that he had a girlfriend but she died.
"Blood in the Streets"
Alison is mentioned again by Jack as Alicia questions his integrity and authenticity once the two meet for the first time.