MADISON, WI (WTAQ) - Prosecutors had delayed filing charges against 18 year old Koalton Peterson because they anticipated a change in his victim’s condition.

They were right. 20 year old Ryan M. Smith died Saturday morning at UW Hospital. Now, the tentative attempted first-degree intentional homicide charges will likely be upgraded at a court hearing next Tuesday.

Peterson had beaten Smith with a baseball bat, fracturing his skull and inflicting lung injuries.

Peterson called it a case of self-defense. The two started arguing over a drug deal last week in Mount Horeb.