(Town of Waupun) A Milwaukee man will spend 15 years behind bars for killing his girlfriend in a single vehicle rollover accident in the Fond du Lac County Town of Waupun. Jonathan Vogel was also sentenced yesterday to seven years of extended supervision. Vogel pled guilty to vehicular homicide in May. The accident happened on State Highway 26 in April of last year. Prosecutors say the 20-year-old had smoked pot and taken Xanax prior to the accident that killed 21-year-old Whitney Domer of Oshkosh.