The following celebrities to also pass away the same year as Lee already have postage stamps in their honor.
Jackie Gleason – Stamp issued 2009
Gleason’s stamp was part of the Early TV Memories collection which the Liberace television program would have qualified to have been a part.
James Baldwin – Stamp issued 2004
From Wikipedia: Most of Baldwin’s work deals with racial and sexual issues in the mid-20th century in the United States. His novels are notable for the personal way in which they explore questions of identity as well as the way in which they mine complex social and psychological pressures related to being black and homosexual well before the social, cultural or political equality of these groups was improved.
Andy Warhol – Stamp Issued 2002