latisha fisher , 35 , has been charged with second-degree murder for allegedly killing 20-month-old gavriel ortiz-fisher with her bare hands inside a restroom at 5 boro burger on west 36th street .
fisher had a violent past and a history of psychiatric problems , but she was evaluated as mentally fit as last year .
the 35-year-old mother allegedly locked herself in the bathroom of 5 boro burger in midtown where she was found holding her unconscious baby boy .
she had been taking medication to combat her paranoid schizophrenia after being diagnosed in the aftermath of the incident .