He works at a movie rental store, a pizza place, a mini-mart, and at a bar. He reveals to Jacket that much of what he sees is not real and instead an illusion, indicating that he himself may not be real. He appears to be a friend of Jacket and gives him free items every time he visits without giving him a say, despite Jacket not showing any care for him.
SPOILER WARNING: PLOT DETAILS BELOW
He is later "killed" by Richter, who wears the unlockable rat mask. However, this scene occurs when Jacket's hallucinations begin, so it can hardly be called accurate.
Sometime later after Hotline Miami, in 1991, it is revealed that Beard survived and was only wounded by Richter.