What a shame, 67 is a young age to die. Becker recently had a procedure which left him unable to tour with Donald Fagen.
Saw Becker perform three times with Steely Dan in the '70s. The first time was at The Rainbow in May 1974 and he played bass. Jeff Skunk Baxter and Denny Dias were the guitarists. There is a great soundboard recording of it on You Tube.
Becker was an excellent instrumentalist and the Dan songs he wrote with Fagen were fantastic.
Becker had a hard life in some ways. At one point he struggled with drug addiction, his girlfriend Karen Stanley died from an overdose, and he was run over by a Manhattan cab. He also had a rough childhood, according to Fagen.
His two solo albums, 11 Tracks of Whack and Circus Money, are well worth checking out.
Weirdly enough nobody seems to have written a biography of him, although there are a few books about Steely Dan.
Jack