This is terrible news. I still remember what a thrill it was to have this amazing new talent show up on Detective back in the late 70s, just as Batman art was sliding into mediocrity and it was finally sinking in that Neal Adams was NOT coming back (there were only about 3 years, amazingly, between Neal's last Batman work and Marshall's first, but as a kid that was an eternity).
Like a lot of kids, I loved comics for the art first, and Rogers' run on 'TEC was one of the absolute highlights of the period for me, along with Garcia-Lopez on the Super-books, Michael Golden on "Micronauts," Byrne and Austin on the X-Men, Perez on the Avengers, Walt Simonson on anything and the occasional Howard Chaykin "Dominic Fortune" tale in Marvel Premiere (or the black and white mags). This was an exciting period where it looked like a whole new generation of artist greats were ready to take the reins.
What a disappointment when Rogers vanished from Batman, then from the face of the Earth it seemed to me. But when he and Englehart reunited for their run on Dr Strange, it was like old times again. What an amazing run that was, cementing Strange once and for all as my favorite Marvel character and providing, for my money, the only post-Ditko material that matters.
I also could never forget that classic "Tales Of Krypton" story with the Christ-like figure. If memory serves, Rogers' pencils were pretty smothered there (as they often were on Mr Miracle) by a lackluster inker, but they were still powerful enough to impress. Then of course there was his amazing contribution to the legendary Superman #400:
https://www.supermanthroughtheages.com/a/400/resist/So sad to know we've seen the last of his contributions to comics. And to go at such a young age. Crud.