LaVell Edwards, who coached Brigham Young for 29 seasons and led the Cougars to a national title in 1984, died Thursday at the age of 86. Former BYU coach LaVell Edwards dies at the age of 86 LaVell Edwards, who coached Brigham Young for 29 seasons and led the Cougars to a national title in 1984, died Thursday at the age of 86. Check out this story on greenfield-westallisnow.com: http://usat.ly/2hwYPrJ LaVell Edwards, who coached Brigham Young for 29 seasons and led the Cougars to a national title in 1984, died Thursday at the age of 86, the school announced.