A college dropout pleaded guilty Monday to fatally stabbing a 31-year-old Madison resident in his home – a stranger killing that shocked the city and remains something of a mystery.
Adam Peterson, 20, acknowledged that he walked into Joel Marino’s home near the University of Wisconsin-Madison campus and used a knife to stab him in the abdomen and chest on Jan. 28. Marino, a musician and employee of a medical device company, was found dying in a nearby alley.