The reason Mr.D was an alcoholic was because his wife left him after he had an affair with Ms. L. She ruined his life and he would remind her of this whenever they got into an argument. He went on a bender one night and mysteriously fell to his death. ????
Back to the present situation.
She tried to say the boyfriend committed suicide, even wrote a suicide note for him posthumously. It the police all of 1 hour to see through her shit and arrest her.