LAKE MILLS, Wis. — A teen from Madison has died after drowning in Lake Mills. Emergency crews responded to Sandy Beach Park around 3:19 p.m. on June 28 after multiple 911 calls of a swimmer that had gone missing. When crews arrived, they determined the teen was last seen in the water. A 14-year-old boy was eventually rescued from the later about a half hour later, but life-saving efforts by medical crews were unsuccessful. The teen, who was iden…