June 9, 1966:
After being buried alive for a week outside of a drive-in theater in Denison, Texas, Lottie Howard married "Country" Bill White. Both of them were "buried alive" practitioners. After she was disinterred, the two left on their honeymoon.
Long Beach Independent Press-Telegram - June 19, 1966
Looks like the marriage didn't last long. Two years later Country Bill got served with divorce papers — while he was buried alive. The papers were dropped down the six-inch pipe he used for air and food.
Wilmington News Journal - Mar 28, 1968
But Bill rebounded pretty quickly from his divorce. Just a few months later he was buried alive with a "34-year-old grandmother" and a go-go dancer. However, they each had individual compartments in the coffin, evidently to prevent any buried-alive hanky panky.
The Indianapolis Star - June 21, 1968
And here's a picture of Bill from 1978, looking a bit rougher around the edges.
The Benton Harbor News-Palladium - May 19, 1978
As far as I can tell, Bill kept doing his buried alive stunt until the late 1980s. In 1981 he set an endurance record for the longest time buried alive (140 consecutive days in a plywood box, 6 feet long by 3 feet wide). This record seems to have been beaten in 1999 by Geoff Smith, who spent 147 days buried in a coffin under the beer garden of his local pub. Though it's hard to know for sure because Guinness doesn't maintain a record for longest time buried alive (because of their policy of not encouraging unhealthy or life-endangering acts).
In 2005, the New Bedford Standard-Times
ran an article about Bill, but that's the last media reference to him I can find. If he's still alive, he'd be around 82.