a man has been charged with second-degree murder after allegedly shooting dead his fiancée .
dimitri harrell reportedly pulled out his gun and pointed it at 19-year-old samirria white after they started arguing over his ` infidelity ' in the bedroom of their st paul apartment at around 3.40 am .
carrying the couple 's three-month-old child , he then shot miss white in the face at close range , according to police .
now , harrell has been charged with one count of second-degree murder at ramsey county district court .