A University of Denver student who is the son of a prominent Wisconsin family has died from injuries he suffered in a skiing accident in January, authorities reported. The Summit County coroner?s office says 21-year-old Joe Lubar of Milwaukee died Friday at St. Anthony?s Central Hospital in Denver. Joe Lubar is the son of David and Madeleine Lubar and a grandson of Sheldon and Marianne Lubar, the Milwaukee Journal Sentinel reported. In 2006, Sheldon Lubar donated $10 million to the University of Wisconsin-Milwaukee?s School of Business Administration, which now bears his name, the paper said.