Like Don Shelby before her, Michele Tafoya couldn't make working for both TV and radio work at the same time.

Tafoya, who has split her duties between afternoons on WCCO Radio and weekend sports reporting for NBC-TV, is stepping down from her radio gig, effective Friday afternoon. She announced the news Monday afternoon on her NBC Twitter feed.

"Have loved the past four years on @wccoradio and will miss PM drive A LOT! we have a great weeks of shows planned before signing off."

"She just runs out of gas," said Mick Anselmo, who runs WCCO Radio for CBS. "She's coming out of 20 consecutive weeks of working seven days a week. We've had ongoing conversations about this. We'd hoped to find kind of a natural break. The Super Bowl is it."

Tafoya, 47, is scheduled to participate in NBC's coverage of the Super Bowl next month and Olympics this summer.

WCCO will move mid-morning personality John Williams to Tafoya's 3 to 6 p.m. shift. Williams, who used to live in Minneapolis, does his radio show from Chicago, where he also works on WGN from noon to 3 p.m. John Hines will fill in Williams' slot on 830 AM for the time being, Anselmo said.

Tafoya joined WCCO on June 1, 2009, taking over Shelby's afternoon-drive slot. A former radio personality on KFAN-AM and a sports reporter for WCCO-TV in the 1990s, she joined CBS Sports in 1994 and graduated to ESPN in 2000 as a sideline reporter for "Monday Night Football" and NBA games. In 2011, Tafoya moved to NBC, where she is sideline reporter for "Sunday Night Football." She will spend 30 days in London covering the Olympics.

Tafoya's schedule was "nuts," Anselmo said. "I don't know how you make it work. She's tenacious and competitive."

Anselmo said Tafoya, who lives in Edina with her husband and two young children, will continue to work for WCCO Radio doing commercial endorsements and fill-in on-air shifts.