Legendary Washington State broadcaster Bob Robertson is missing Friday's Apple Cup, snapping a string of 567 consecutive games. 

Washington State football announcer Bob Robertson watches team practice from stands at the Los Angeles Coliseum, Dec. 27, 1997. (AP Photo/Gerard Burkhart)

Robertson was ill and unable to make the trip from his home in the Puget Sound area to Pullman for Friday's game between No. 6 Washington and No. 23 Washington State. The winner will claim the Pac-12 North title and a spot in the Pac-12 championship game. 

Robertson's absence was announced during the pregame radio show. Robertson's streak started in 1964 and included a three-year stint calling Washington football. He did miss the 1981 Holiday Bowl because of a broadcast contract dispute. 

Robertson has been a fixture of Washington State football beginning in 1964 and covering every season since except for a brief span between 1969-71 when he called Huskies games. Robertson also called Washington State basketball for 23 years. 

Robertson gave up primary play-by-play duties of Washington State football three years ago, but was still part of the broadcasts.