A boater found Dontrell's body in Lake Michigan Thursday.
An autopsy found that the boy had been strangled.
Johnson was charged with the toddler's murder Friday.
No bond for dad accused in toddler's murder
October 9, 2010 (CHICAGO) Prosecutors say 30-year-old Donald Johnson picked up his 14-month-old son, Dontrell on Monday and later called the boy's mother, threatening to harm the child.
