Bert Deeley is a minor character who appears in Season 5 of Fear the Walking Dead.
Pre-Apocalypse
Not a lot is known about Bert before the outbreak, except that he lived in Texas and worked at the Texas Power Plant.
Post-Apocalypse
As the outbreak intensified, Grace began to call in more and more plant workers in order to keep the reactors stable, with Bert been one such worker. At some point one f the reactors went into melt down and killed a lot of those at the Texas Power Plant, Bert included.