Exec producer Chris Mundy has exited CBS’ upcoming “Criminal Minds” spinoff in a showrunner shakeup.

Ed Bernero, exec producer and showrunner on the “Criminal Minds” mothership, will now run both, focusing much of his attention on getting the spinoff (official name: “Criminal Minds: Suspect Behavior”) up and running.

With Bernero spending more time on “Suspect Behavior” (which he also exec produces), some oversight on “Criminal Minds” has shifted to Simon Mirren and Erica Messer — who were elevated to exec producer at the start of this season. (Bernero still remains official showrunner on both.)

The “Suspect Behavior” showrunner switch comes as other new and returning series have also faced changes at the top. CBS’ new Tom Selleck drama “Blue Bloods,” for example, saw original showrunner Ken Sanzel exit this summer.Mundy, meanwhile, remains based at ABC Studios, which produces “Criminal Minds” with CBS TV Studios.

Bernero’s double “Criminal Minds” duty is similar to Shane Brennan’s dual showrunner hats on “NCIS” and “NCIS: Los Angeles.” Mundy had never served as a showrunner; change was made after the studios decided the spin-off needed more direction from Bernero, who helped turn “Criminal Minds” into a solid hit for CBS.

Mundy’s credits include “Criminal Minds,” where he first wrote the episode last season that became a backdoor pilot for “Suspect Behavior.”

“Suspect Behavior” stars Forest Whitaker, Matt Ryan, Michael Kelly, Janeane Garofalo, Beau Garrett and Kirsten Vangsness (who’s splitting her time between both “Criminal Minds” shows).

Besides Bernero, exec producers include Mark Gordon, Andrew Bernstein and Deborah Spera.

Busy Bernero is also ramping up his development slate, having sold a handful of projects with Rob Kim.