A little light bulb idea on the letter.
As I had written a little while back about the possibility that Herb was still alive, that through the de-institutionalization of psychiatric patients Herb was released.
The female may have been a nurse at the facility or someone he met. He may have written the letter for Johnny, but because of fear of being placed back into another institution he disappeared. He may have told the woman to keep the letter for a specific amount of time, so that no one could find him.
Time passed and the woman may have forgotten about the letter or she just didn't know how to contact Johnny. She may also have known about Johnny's coma and knew Johnny wouldn't be able to respond to the letter, so she kept it. Johnny over the past years has had many newspaper articles written about him. Maybe because of his notoriety she now knew that he was out of the coma, but she still didn't know how to contact him or was unable to because of security issues. She contacted Walt, the Sheriff in an attempt to get information about Johnny. Walt trying to protect Johnny, probably wanted to verify what the woman had told him by meeting her in the park. He was on his way to see Gene, to verify the contents of the letter when he was killed. Gene kept it a secret about Walt's death until Johnny had the vision about it. What if Walt had time to give Gene the letter before he died? Maybe Gene is still trying to cover his butt by not letting Johnny know that he has kept yet another secret about Herb.
Gene will eventually tell Johnny. Johnny will then go in search of his father using his visions to help people along the way!
Just an idea!
