At the time, someone asked if he had been wearing a helmet, and I said I guessed not, but I wasn't sure. Well, the Chicago Tribune on July 21 ran a story about the dangers of bike trails. In the story they mentioned that this poor guy had been skating without a helmet.
The story mentions that on the exact same day, June 20, there was another bike trail death in the Chicago area. On the lakefront path a woman died after her bicycle hit another in a head-on collision. Whether she had a helmet, they don't say. Probably not, if I had to guess.