<p>not in the last 10 years but-
Stanley B. Prusiner, Medicine, 1997, solo award, double alum</p>
<p>from Wikipedia:
Ahmed Zewail, Chemistry, 1999 (alum, solo)
Alan MacDiarmid, Chemistry, 2000
Alan J. Heeger, Chemistry, 2000
Hideki Shirakawa, Chemistry, 2000
Raymond Davis, Physics, 2002
Irwin Rose, Chemistry, 2004
Edward C. Prescott, Economics, 2004
Edmund S. Phelps, Economics, 2006
George E. Smith, Physics, 2009</p>