He started all 12 games at left guard and received honorable-mention All-Mountain West Conference honors, while blocking for future San Francisco 49ers teammate and number one overall draft pick quarterback Alex Smith.

[1] Herrion was signed as an undrafted free agent by the Dallas Cowboys after the 2004 NFL draft on May 20.

[5] In February 2005, he was allocated to the Hamburg Sea Devils of NFL Europe, where he started 10 games at left tackle and received an invitation to attend the 49ers training camp.

The cause of death was later determined to be ischaemic heart disease, or (according to a subsequent examination of the autopsy report) hypertrophic cardiomyopathy.

[6][7] He was considered to be the NFL's fourth football-related death after Detroit Lions wide receiver Chuck Hughes died of a heart attack in a 1971 game against the Chicago Bears, St. Louis Cardinals tight end J.V.

On the front page of the San Francisco Chronicle, former 49er coach Mike Nolan commended Herrion for being "musical".