Matthew Ascaridis, 45, of Highland Park was found about 5:10 a.m. Saturday, when Highland Park police responded to a report of an unconscious person on the shoreline in the 0-100 block of Cliff Road, officials said.
The 45-year-old went outside to speak with individuals who were being loud on the lakeshore shortly after 1 a.m. Saturday.
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He was killed in a violent confrontation that followed, a preliminary investigation showed.
Two other men involved in the confrontation, 20 and 18 years old, were injured, police said. They were hospitalized and are speaking with investigators.
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The Lake County Forest Preserve Police Department continues to investigate.
The video in the player above is from an earlier report.