A Connecticut man found guilty of killing four people has failed to convince the state Appellate Court that his convictions should be thrown out because he was referred to by his nickname, Killer, at trial. Marco Camacho was convicted in the 1996 murders of four people inside a Southington home. Prosecutors say he and an accomplice went to the house to collect a $400 drug debt, and when they were not paid, Camacho became enraged and shot everyone inside. Camacho appealed, arguing in part that a witness at the trial referred to him as Killer, even after being told by the judge not to use the nickname. The court ruled Monday that Camacho’s lawyer failed to prove that use of the name prejudiced the jury enough to warrant a mistrial.