I'm not sure if he was a case of partial leucism or if maybe an old wing injury could have caused it. I didn't see him again in 2011, though I admit to paying close attention to each and every catbird that was around, hoping to catch that glimpse of white again on one of the mewers. I wonder what became of Lefty White - did he survive that fall's migration? Did he get picked off by a predator because of his flashy patch? I'll never know his fate, but it was fun to have him around while he was here.
Of all the hours I seemed to have spent in the close proximity to Lefty White that summer, this is somehow the only photographic documentation I got of him - I know, this is inexcusable. At least he spread his wings and tail a little and made sure his dark cap was visible...
Just so you don't feel ripped off by the lack of decent bird photos in this post, here is a cool video I found online that may satisfy your need for more Whitey a la Dumetella...