NEW : Philip Nelson faces one count of 1st - degree assault , one count of 3rd - degree assault . NEW : Police are looking for another suspect , identified as a white male in his early twenties . NEW : Nelson is suspected of attacking a former student at Minnesota State University . Kolstad is in critical condition , his family said . NEW : Isaac Kolstad dies in December ; his family remembers him as a caring father .
NEW : Philip Nelson faces one count of 1st - degree assault , one count of 3rd - degree assault . NEW : Police are looking for another suspect , identified as a white male in his early twenties . NEW : Nelson is suspected of attacking a former student at Minnesota State University . NEW : Isaac Kolstad dies in December ; his family remembers him as a caring father .