Wendy and Marty referred to Ben in earlier seasons of Ozark, but he never appeared on the show until Season 3. He was working as a substitute teacher when he lost his temper when one of his students had a compromising picture sent to the whole class. He collected all his students phones, threw them into a wood chipper, and then assaulted a nearby worker, subsequently getting fired from his job.
Running from the police, he goes to find his sister in the Ozarks. He shows up unexpectedly, leaving them to assume that he was in a bit of trouble. Ben asks to stay, which at first they are hesitant about. Marty directly asks Ben to leave but Wendy eventually tells him to stay because she needs the support.
Ben helps out around the house and hangs out a lot with Jonah. He gets a crush on Ruth Langmore and asks her out several times, even though she continues to push him away. Despite this, Ben and Ruth develop a relationship and eventually fall in love, even though Ruth knows that Ben has bipolar disorder and went off his meds. Wendy pleaded with Ruth to break things off with Ben because when he's off his meds he's a danger to himself and others, but Ruth continues to see him anyway.
Ben starts to blow up at people- at Wendy, at Marty, and at Helen. He tells Erin, Helen's daughter, that her mother is a lawyer for Omar Navarro, which triggers Helen to give the order to have Ben killed— for the purpose of not allowing Ben to reveal anything about the operation.
Ben goes on the run- first with Ruth and second with Wendy, but he proves to be an unreliable danger and Wendy gives up. She tells Helen where he is and she sends a killer to get Ben.
The cartel hitman, Nelson, brings his body back to be cremated in Marty's funeral home.