Ranes v. American Family Mutual Insurance Company, 219 Wis. 2d 49, 580 N.W.2d 197 (1998)
An insured person injured in a car accident settled with the tortfeasor and then sued his insurer for underinsured motorist benefits. The insurer claimed that the lack of notice precluded it from seeking subrogation from the tortfeasor. Writing for a unanimous court, Abrahamson brought Wisconsin law in line with that of other states. She held that an insured’s failure to give notice to his insurer that he entered a settlement with the tortfeasor creates a rebuttable presumption that the insurer was prejudiced by the lack of notice. The insured must prove that the insurer was not prejudiced.