No conclusion: Autopsy unable to pinpoint Herrion's cause of death

As he walked off the field on a relatively cool Colorado evening, Thomas Herrion was huffing and puffing. Still, he didn't look much different from his 49ers teammates who had been playing alongside him during the game's fast-moving final seconds.
A few minutes later, the San Francisco offensive lineman collapsed near his locker. He was rushed to the hospital, pronounced dead at age 23.
The coroner's office in Denver performed an autopsy Sunday, but said no cause of death could be determined until toxicology tests were performed. The tests usually take about three to six weeks.
"Our thoughts are with the Herrion family and the 49ers," NFL spokesman Greg Aiello said. "We will be in contact with the 49ers to learn the details of what happened."...