His website and Wiki are showing ''February 20, 1950 - September 3, 2017''. 
 
Edit: I see it's been confirmed 

http://www.rollingstone.com/music/news/walter-becker-steely-dan-co-founder-dead-at-67-w500956
 

Yes, just saw that. 

Well, that's a depressing way to start the day!

WOW sad news indeed ...
 
He was a nice guy , I sold him a chorus pedal when I worked at Sam Ash Music around 1980'ish  ..
 
Kenny
 

Very sad, his and Donald's music filled our house when I was a kid and I still listen to Steely Dan regularly now. Some of his solo work is great. 

I thought Walter Becker was the fictional character who cooked meth in a motorhome, so thanks for clearing that up. Now I am sad.

Very sad to hear that. I’ve loved Steely Dan ever since I first became aware of their music in the late seventies. The Royal Scam is still one of my all-time favourite albums.

Steely Dan sparked my interest in instruments- I remember asking my mom when Reelin in the Years came on what instruments they were playing. She didn't know. That was 72 or 73. That started a lifelong hobby for me. Ironically I just saw Donald Fagen last night at the Moody Theater in Austin. Awesome show with a young quintet. I was impressed. R.I.P. Walter Becker

bitflipper
I thought Walter Becker was the fictional character who cooked meth in a motorhome, so thanks for clearing that up. Now I am sad.

 I thought the same thing (Being in the coffeehouse, I was thinking up a tongue-in-cheek response.  Glad I wasn't the first to reply!  Gotta dig out one of my Best of Steely Dan CDs.  Think I'll put on the Live version).