DNA extracted from the handle of the knife that killed Joel Marino, along with hairs found on a backpack and knit cap, tied a former UW-Madison student to Marino’s death on Jan. 28, according to a criminal complaint filed Friday.
Adam C. Peterson, 20, of Grant, Minn., was charged with first-degree intentional homicide for allegedly stabbing Marino, 31, to death at his home on West Shore Drive.