A go-cart crash in Lake Delton has killed a man from DeWitt, Iowa.  The Wisconsin State Journal reports the 45-year old man lost control of the go-cart late Wednesday afternoon about 5:15pm at the Alley Go-Cart Track on Wisconsin Dells Parkway.  The go-cart had struck a wooden post along the track.  The man suffered a severe head injury.  UW-med-flight was called but initial treatment was unsuccessful.  He was pronounced dead at the scene about 45-minutes after the crash.  The name of the man has been released pending notification of relatives.