The television viewer who reported the illegal drop Tiger Woods took during the Masters was more than just a golf fan.
Sports Illustrated reports it was David Eger, a rules expert who has worked for the USGA and the PGA Tour.
Eger says he was watching the Masters when he replayed the 15th hole to see how Woods made bogey.
Woods hit the pin with his third shot and it caromed back into the water.
He dropped from the same area, hit to 4 feet and made bogey.
Eger told the magazine he noticed a divot, and that Woods took his drop behind it.
The Champions Tour player says he contacted a PGA Tour rules official at the Masters, who relayed it to Fred Ridley, chair of the Masters competition committees.