The case of a Chicago attorney who went missing while running along the Lakefront Path in January ended when his body was found in Lake Michigan earlier this week.Kevin Narko, a 52-year-old sole practitioner who formerly worked at Winston & Strawn LLP and Seyfarth Shaw LLP, went for a run along the path — one of his favorite things to do, no matter the temperature — on Jan. 30. A few months earlier in October, he was hospitalized due to a previously undiagnosed heart condition.On Monday morning, more than …