When Charlotte Jane appears to Patrick Jane and annoys him about how he has wasted his life, its a turning point.

Patrick decides he will kill Red John AND have a life after. Patrick Jane and Red John meet 3 times after Patrick figures out Red John's identity. Intrigued? *Your mouse wanders to implausible*

For those still reading, please read this theory if you can:

http://www.whoisredjohn.com/See-a-theory-Red-John/11340