Back on September 28th, Ratt played a show in New York, and Stephen Pearcy was slurring his words, stumbling around on stage, lying down on the drum riser, and even forgot the words to some of the songs.
Shortly after the performance, he issued an apology to fans and said he had been "dealing with a pain-management issue due to a bad knee that is scheduled to be replaced in January" and added that he made the "critical error of adding alcohol to my pain meds while on stage" which destroyed the performance.
Fast forward to a week later (October 5th), and we saw the same behavior from Pearcy at a show in Illinois. Fan filmed video of that is below.
Hopefully he gets the help he needs sooner than later. Read more here.