FLAGSTAFF, Ariz. (AP) — Authorities say a Cottonwood couple is dead after a car accident in Flagstaff.

Flagstaff police say Charles Alderson and Leah Alderson both died at a hospital following the single-vehicle crash about 10:30 a.m. Friday.

Both were 61 years old.

Police say the cause of the accident is currently under investigation, but it may be related to a medical episode.

They say Charles Alderson was driving the car when it left the roadway and struck a drainage culvert.

Flagstaff Police Department's accident reconstruction team was called to out to investigate the crash.