I had no idea he was even in town until I saw a blurb in the free newspaper about it yesterday. I thought it was cool that he was still performing at age 84. Imagine my surprise when I came online today and found out about this:
http://www.nydailynews.com/entertain...=entertainment
Though Berry picked up his guitar soon after his collapse, he was subsequently joined on stage by a bunch of burly men and was escorted off stage an hour into what the Chicago Tribune called a "rapidly-deteriorating concert."
An audience member said Berry was backstage for 20 minutes, though he returned to explain what happened to the crowd as his registered doctor stood nearby.
"I begged him to let me come out and say something to my fans here," Berry told the crowd. "When I was sitting at the piano and stopped playing, I was about a 10. I had to lay my head on the piano; I had no strength at all."
He added that after 10 minutes of "blood pressure and all that stuff," he felt like he was "about 65 or 70."
Berry then went to grab his guitar but someone apparently took it, causing the crowd to boo.
"They're afraid I'm gonna do my scoot, but I'm gonna try to do my scoot for you anyway," he said.
The octogenarian then proceeded to duck walk his way off the stage to cheers from the crowd. 
I hope he's doing OK. I hope I have half his energy if I make it that far.