After relatives were unable to contact her, they broke down the door to their home in Várzea Paulista, São Paulo, and found her dead and the apartment covered in blood, according to Brazilian news outlet Globo.
Araújo had also suffered knife wounds to his neck and wrists, following a failed suicide attempt, police believe.
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When questioned by detectives, Araújo changed his story several times, before finally admitting he slashed the make-up artist's throat with a blade during intercourse, when they started arguing about the pregnancy.
Investigators believe a post made on Francine's Facebook page on December 23, bemoaning the fact Francine's family did not support the marriage, was actually written by her husband the day after he killed her.