The tragic news was announced on his website and lists the day of his death on Sunday (September 3).
His death comes after Becker missed Steely Dan concerts in August due to an unspecified condition.
Rolling Stone reported that Becker's doctor told him not to leave his home in Maui for the July performances.
Steely Dan has sold more than 40 million albums worldwide. We play rock & roll, but we swing when we play.
He added, "I learned music from a book on piano theory. We didn't. That was that".
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"Just some ideal balance of musical sensibilities. https://www.youtube.com/watch?v=2WTh_IEyU1w --(Without Cosby)'Rikki Don't Lose That Number" was off Pretzel Logic, and appears to be a favourite of Steely Dan fans.
For 1975's Katy Lied, the now-duo - with Becker also picking up guitar duties - surrounded themselves with a team of expert studio musicians that included Toto's Jeff Porcaro, guitarist Hugh McCracken and Michael McDonald.
The Grammy-winning band split up in 1981 but reformed in the 1990s, releasing a handful of successful albums.
"It's quite recently such a decent band and enchantment stuff happens constantly, and stuff happens when you're playing together where you get into a sort of gathering mind that is extremely exciting", Becker said in 2008 of visiting with Steely Dan.
We're told Becker had been very ill and underwent surgery last month.