"There were some changes over the summer," Roach said, referring to the decision to kill Donna (Erinn Hayes) and promote Remini.
"Season 1, there was very good chemistry between Kevin and Erin and I always heard, 'Oh Kevin and Leah … the chemistry!' I was like 'Ok, alright,'" Roach explained. "Then when you see it, you're like 'Oh, okay!' She makes him funnier. I don't know what it is. He's very funny as it is, but when you add her to the mix [and] they start playing off each other, it's really incredible."
Unfortunately, judging by the decline in ratings this season, fans are feeling the same way about the casting change.
Kevin Can Wait airs on Monday nights at 9 p.m. ET on CBS.