Williams, who turns 32 on Sunday, had been with the team since last season. In 54 races at Kaulig Racing, Williams had no wins, no top-five finishes and six top 10s. He placed 18th in the points last year and is 19th in the standings this season. Williams has 240 career Xfinity starts with 17 top-10 finishes.

The NASCAR Xfinity Series season continues with the Pennzoil 250 at Indianapolis Motor Speedway. See Saturday's starting lineup here.

Under NASCAR’s rule revision this year, team owner Richard Childress must apply for a waiver for Hill to be admitted to the playoffs since he is missing the Iowa Xfinity Series race. Austin Dillon is driving Hill’s Xfinity car at Iowa.