A Dane County judge has imposed a 20-year prison sentence on a man convicted of killing his girlfriend’s daughter.  Joshua Gehde was watching the two-year-old girl in April 2016 when he found her unresponsive.  Gehde said they had played at a nearby park, then returned home and she was eating while he was on the phone.  He said he heard her coughing and found her not moving.  Injuries were found on the child’s head, back and bottom and she died two days later.  The examining doctor told authorities the girl’s injuries were consistent with a child who has been abused.