Maksim Chmerkovskiy won't be back on Season 19 of Dancing with the Stars - at least not as a pro dancer. [...] it's possible that Chmerkovskiy - whose brother Val is also a pro dancer on Dancing - could be a judge on the show, especially if Len Goodman does leave the panel, as he revealed in the finale he had been planning to do. (Chmerkovskiy guest-judged on Season 17 and on the Indian version of Dancing.) Or, he could perhaps act as a mentor, as Randy Jackson now does on American Idol. Dancing with the Stars returns for Season 19 on Monday, Sept.