Oh sure, won it twice, but never unshared, so, what a loser. /sarc
It's a little odd that no one else has ever won a second one, but of course, there are more scientists in each succeeding generation, and it used to seem unlikely to be any more Nobels in Physics that are unshared, the last time was in 1992, whichi is a while ago already.
The unshared ones have tended to be awarded near the ends of lives or ends of careers, a sort of lifetime achievement award.
4 people have won 2 Noble prizes. Linus Pauling, Marie Curie, John Bardeen and Frederick Sanger