This story was updated at 6:11 p.m. with additional details.
Cameron Bean, 28, has reportedly died after being struck by a car on Saturday, according to friends.
The driver told police that the sun got in her eyes, causing her to veer off the road where she hit Bean. Bean was wearing reflective running shoes and clothing and was running against traffic, according to a police report.
He was listed in critical condition following the accident, but reportedly passed away today, according to several friends.
Investigators will conduct a follow-up interview with the driver and are recreating and reconstructing the crash to verify exact driving conditions and the cause of the accident.
Investigators are also downloading and collecting electronic data.
Kyle Miller, spokesman for the Chattanooga Police Department, said the case will require extensive follow-up by investigators, and said police will not release any additional information "that is not verified through thorough review."
Any charges against the driver are pending further investigation, Miller said.
Potential charges would require the investigative information presented to prove negligence and/or intent, he added.
Bean was an athlete at ZAP Fitness for five years, and a Facebook post by the group mourning his passing drew dozens of condolences from those who knew him.
He ran for The Baylor School and attended Samford University, winning races at both schools and setting several unbroken records at Samford, according to his personal website. He was the 22nd fastest American in 2012 in the 3,000 meter steeplechase, missing the Olympic trials by two spots, according to his biography online.
A man of faith, he compared Christianity to running:
"I understand now that I am far from perfect, and that a personal relationship with Christ, like running, requires the time and faith if you want spiritual growth," he wrote in a blog post.
Bean worked at Fast Break shoe store, and also ran Magnum Training, a personal coaching business that helped runners and triathletes reach their potential.