Esse personagem era Rankin e Dexter o matou com raiva. Não era como o seu assassinato planejado psicopata anterior, mas sim uma morte de raiva sociopata.

Até a alucinação de Harry diz a ele que essa é a primeira coisa humana que ele fez desde a morte de sua esposa.

E ele não é o único assassino fora do código de Harry, existem muitos, de dexter.wikia.com :

Kills Outside The Code

Every season (after Season Two) saw Dexter kill at least one person that didn't meet Code, intentional or otherwise.

• Season Three

  Oscar Prado - Killed during a struggle at the home of a drug dealer. ("Our Father")

  Nathan Marten - Pedophile, killed for taking photos of Astor. ("The Lion Sleeps Tonight")

  Camilla Figg - Mercy kill, at her request. ("Easy as Pie")

• Season Four

  Jonathan Farrow - Killed in a 'kill room' and dumped him in the Gulf Stream. Dexter believed him to be a killer but it was actually his assistant. When Dexter found out that he was innocent, he deliberately broke Farrow's blood slide. ("Slack Tide")

• Season Five

  Rankin - Killed on the spot, out of anger. ("My Bad")
  Stan Liddy - Killed in self defense, although Liddy may have killed somebody at some point since he was a former police officer. ("Hop a Freighter")

• Season Six

  Norm - Killed when he demanded money from Dexter, although Dexter knew that the gun being held on him was not loaded. ("Nebraska")
  Alberto - Killed for robbing Cuban immigrants and threatening them with a gun. ("This is the Way the World Ends")

• Season Seven

  Clint McKay - The first and only innocent victim to receive a ritualistic kill (wrapped in plastic and dumped into the ocean). ("The Dark... Whatever")

• Season Eight

  Andrew Briggs - Killed during a struggle (which he caused). ("A Beautiful Day")

    

Pode ser discutível se fosse real, já que o homem não recebe um nome e nunca mais aparece. E eu não me lembro se ele alucina Rita, mas o episódio está cheio de flashbacks quando eles se conheceram e começaram a namorar.

No entanto, à medida que o programa avança, fica claro que Dexter não é realmente um sociopata do "livro de texto" (por padrões de TV), mas um introvertido traumatizado que realmente se sente MUITO profundamente sobre os outros. Sua reação à morte de Rita, junto com o que ele faz por outro personagem na quinta temporada, é a prova sólida da humanidade desperta de Dexter, mas isso em parte leva Dexter a ter mais problemas em temporadas posteriores, onde ele não faz. t sempre se atenha ao código ou cometa erros. Então, de certa forma, isso é como um lead-in para essa ideia. Até mesmo a morte de Rita foi um subproduto de Dexter dividido entre a idéia de querer um companheiro para entendê-lo (algo que foi incutido nele no momento em que ele soube do irmão, que mesmo naquele momento, Dexter escolhe Deb com Brian) e querendo salvar a vida das crianças, já que Arthur Mitchell desafia totalmente o código de Dexter.

Nota: existem alguns episódios que são mais surrealistas do que outros, como o episódio Left Turn Ahead na sétima temporada ...

Dexter Wikipedia - Temporada 5.01 Meu Mau - Sinopse do enredo:

The boat runs out of gas and Dexter pulls in. In the store, he watches as an angry man repeatedly rings the service bell to get the key to the bathroom. When nobody comes, the man searches the desk until he finds the key himself, and turns around, taking offense to the way Dexter is staring at him and angrily calling him a retard for doing so. Offended, Dexter follows him into the bathroom, and tries to earn the man's sympathy by telling him that his wife died that week and it was his fault. But the man doesn't seem to care and furiously responds by saying (in a sarcastic, slightly skeptical tone of voice) "Well, I'm real sorry for your fucking loss, but your dead wife can suck my dick." An enraged Dexter attacks him, and after a brief fight, kills him. As he backs away from the man's cadaver, Dexter looks into the restroom mirror and sees Harry, who tells him that that's the first human thing he'd done since his wife's death. Harry tells him that he can show what hes feeling. Dexter finally lets his guard down and starts to shriek from both anger and grief over losing Rita. Harry tells him that he needs to go back. Dexter arrives at the funeral and while giving heartfelt eulogy, he realizes that Rita wasn't just part of a cover life-he actually did love her. http://dexter.wikia.com/wiki/Episode_501:_My_Bad

Editar:

Eu vejo que Ankit Sharma encontrou o nome e sua página wiki.