Riverdale actor Ross Butler, who plays Reggie Mantle, is being replaced due to outside commitments making him unable to film the second season, according to showrunner Roberto Aguirre-Sacasa.
“We love what Ross did with the role of Reggie [this season], but because of his commitments to other projects, we couldn’t use him nearly as much as we would have liked,” Aguirre-Sacasa told TVLine. “[Next season], we want more Reggie on our show - he’s Archie’s rival! - and because Ross is unavailable to come back to Riverdale, we’re looking for a new Reggie. Those are big shoes to fill, but we’re confident we can find an actor who is as funny and sexy as Ross. And of course we all wish Ross the best.”
Although the "other projects" are unspecified, the only other project Butler is publicly working on is the Netflix show 13 Reasons Why. The first season debuted in late March, but unlike Riverdale has yet to be renewed for a second season. TVLine, however, said the streaming show "is a lock" for renewal.
Riverdale's first season is scheduled to conclude May 11, with a second season expected in early 2018.