DECATUR -  A 23-year old Decatur man is now behind bars and charged with the death of his fiance’s son.  Devon Sawyer was arrested last night in the death of 2-year old Michael Weeks.  The little boy was found unconscious in his home at the Ivy Park apartments over the weekend.   Emergency workers transported the child to a hospital where he was pronounced dead.   Investigators say the child showed signs of severe bruising all over his body.  The little boy’s mother,   Danielle Calhoun was away from the home at the time but said Sawyer told her,  he and the child took a nap,   and when he woke up he found the child had been injured.