From Chicago Tribune:
An autopsy Wednesday determined a man found floating Tuesday in Lake Michigan on the North Side had been shot in the head and his death was a homicide, authorities said.A jogger spotted the body floating in Montrose Harbor about 8 p.m. Tuesday and called police, according to the Cook County medical examiner's office. He appeared to be in his 40s, but remained unidentified Wednesday afternoon, an office spokesman said. An autopsy showed he had suffered a gunshot wound in the head, the spokesman said.
UPDATE: The police believe the body is that of Artur Shehu, the Villa Park cabdriver who left his cab at the lake with a suicide note in it after he allegedly murdered his parents last January.