Jimmy has a personal vendetta against Howard Hamlin.

                                            Howard Hamlin feels responsible for Chuck’s death.  Michele K. Short / AMC / Sony Pictures Television

Jimmy blames Howard for the death of his brother, Chuck, a former colleague and associate of Howard in Hamlin Hamlin & McGill (HMM). Chuck got permission from the company when he began to suffer from an illness, claiming he was sensitive to electromagnets, which prevented him from leaving home. After Howard forced Chuck to retire from the company, Chuck died in a fire that broke out. For years, Jimmy wanted nothing more than a place at the table and to work at HMM. Not seeing his brother well enough, Chuck prevented him. At the time, Howard was respecting those wishes. In Season Five, feeling responsible for Chuck’s death, Howard offered Jimmy the opportunity to work at HMM as soon as he saw the company he was starting to build as Saul Goodman, but Jimmy was offended. Not only did it look like a pity he got hired, but he also came a little too late. Instead, Jimmy decided to dedicate himself to making Howard’s life miserable and to fight over his name. In the fifth season, he threw bowling balls at his car and sent prostitutes to disturb a lunch meeting.