Denise Petski, Nellie Andreeva CBS Television Studios has parted ways with top showrunner Peter Lenkov.A spokesperson for the studio just released the following statement:“Peter Lenkov is no longer the executive producer overseeing MacGyver and Magnum P.I., and the Studio has ended its relationship with him. Monica Macer will be the showrunner on MacGyver, and Eric Guggenheim will run Magnum P.I.