Denver, CO Austin Strasser, 3, killed when he, his sister Audrey Strasser, 5, and mother Tiffanie Strasser were struck by car while walking in a crosswalk on University Boulevard in Denver, ColoradoAccident Date: Fri, 02/13/2015At about 5 p.m., Tiffanie Strasser and her children were legally crossing in a crosswalk when a driver turned southbound onto University Boulevard from Ohio Avenue and struck them.