Larsen raced with Lance Armstrong on the Motorola team in the 90s, he won the NORBA National Cross Country title in 1998 and 2000, and competed in world class triathlon events in 2001, finishing well.
Steve Larsen owned WorldTri.com and was a regular contributor to Xtri.com, where he did product reviews.
This reminds me of runner Jim Fixx the runner and author of The Complete Book of Running who died of a heart attack after his daily run in 1984. I was a runner back then and I followed his running advice in his book religiously.
The cause of Larsen's death has not been determined.
I'm saddened at the loss of Larsen, who leaves behind five children and his wife Carrie. More at Bike Radar.