One book I purchased at SBL this year is They Shall Purify Themselves: Essays on Purity in Early Judaism (Brill/SBL, 2008). I bought it because it looks like a significant contribution to an important subject, but also because it is by Susan Haber, a friend and fellow grad-student at McMaster University who died suddenly of pancreatic cancer in 2006.
The monograph was edited by Adele Reinhartz, one of Susan's (and my) former professors.
I've heard of students who edit their professors' posthumous work. But a senior scholar who takes time out of a busy schedule to edit a student's work for publication--who does that?
The answer, I suppose, is someone who puts character before career.