The Oklahoma Highway Patrol reported a delayed fatality from a Jan. 19 crash in Lincoln County.
Officials said 30-year-old Rustin Eric Bender failed to negotiate a curve, departed the roadway and struck the end of a guardrail.
Bender's vehicle overturned twice and then struck a creek embankment.
Bender's condition after the crash is still under investigation, but OHP reported that he was neither wearing a seat belt nor did his airbag deploy.
He was admitted in critical condition at OU Medical Center.
OHP confirmed Bender's death took place on Feb. 26.