The Garfield County Coroner’s Office has identified the man found dead alongside westbound Colorado Highway 82 near Carbondale on Sunday as 38-year-old Matthew Cox of Glenwood Springs.

Authorities responded to the scene around 10:18 a.m. Sunday after Cox was discovered down an embankment off the westbound shoulder near mile marker 10.5. He appeared to have been riding his bicycle from Carbondale to Glenwood Springs on Friday evening, according to a release from the coroner’s office.

Initial reports from the Colorado State Patrol described the case as a possible hit-and-run, but autopsy results released Monday from the coroner’s office have since clarified that no traumatic injuries were found and that the cause of death remains undetermined. His official cause and manner of death remain pending further toxicology, pathology and investigative results.

The incident closed the westbound lanes of Highway 82 between Carbondale and Catherine Store for several hours Sunday while investigators responded. The highway has since reopened in both directions.

Colorado State Patrol is asking anyone who may have seen Cox riding a red and white bicycle between 9:30-11 p.m. Friday on Colorado Highway 133 or westbound Highway 82 to contact dispatch at 970-249-4392 and reference case number VC250191.