Glenn made his best-known report on January 28, 1986, when he anchored CBS News Radio's live coverage of the launch of the Space Shuttle Challenger. Glenn had just signed off—after what was thought to have been a normal launch—when the shuttle disintegrated, killing the seven astronauts on board. "I had to get back on the air real fast to describe that, and had a very difficult time doing that," he recalled. Glenn and correspondent Frank Mottek (now a reporter at CBS Radio Station KNX in Los Angeles) covered the Challenger disaster from that point as a CBS NetAlert bulletin.