A 37-year-old Hebron woman and her one-month-old son were killed in a two-vehicle crash Thursday morning in south Lake County. Lake County Sheriffs Police say the preliminary investigation shows a Trailblazer driven by Stacy Walstra was traveling westbound on East 181st Avenue, or State Road 2, between Lowell and Hebron, when her SUV began to fishtail on icy precipitation that formed on the road and slid into the eastbound lane of traffic into the path of a semi. Police say it's believed the semi had no chance to avoid the collision. The driver of the semi has been cooperative with deputies, police say, and the crash remains under investigation. The Lake County Coroners office say Stacy Walstra was pronounced dead at the scene shortly after 12 noon, and one-month-old Jace Walstra died at 1 pm at an area hospital. Both died from injuries suffered in the crash, officials say.