Errrr, no way. I'd never trust someone like that. To be able to kill someone, they must have some serious problems, whether it be extreme anger problems or psychosis.
Someone that uses horrific grammar and pronounces everything weird?
Absoulutly not. Someone with a great sense of humor, but didn't know when to shut up (IE, a racist joke in front of a black guy, a religious joke at church, a sex joke in front of your grandparents...)