US National Team assistant coach Glenn Myernick passed away early Monday morning, four days after suffering a heart attack in Colorado.
"He will truly be missed by all of us in the US Soccer family," read a statement from USSF president Sunil Gulati. "Our thoughts and prayers are with his wife Nancy and his children at this difficult time."
The 51-year old - an intuitive, hearty fellow best known simply as "Mooch" - had been the right-hand man to erstwhile US boss Bruce Arena since 2000.
He worked the last two World Cups as coach, and also served under Arena with the 1996 Olympic team.
In addition, Myernick led the 1993 US Under-17 squad at the World Championships in Ecuador, enjoyed a very successful four-season stint as manager of the Colorado Rapids of MLS and coached the U-23's during qualifying for the 2004 Olympics.
As a player, he won the 1976 Hermann Trophy as the best collegiate player in America wearing Hartwick colors, captained the National Team during his 10 caps and was an NASL MVP with Portland in 1982.