An Arizona man is facing a manslaughter charge in connection with a collision that killed the sister of former U.S. Supreme Court Justice Sandra Day O'Connor on Saturday.
Pima County Sheriff's officials in Tucson said Sunday that 24-year-old Jarrad Barnes has been booked on one count each of manslaughter and driving under the influence.
Barnes was arrested immediately after being released Saturday night from a hospital for non-life-threatening injuries.
The sheriff's office did not know if he had an attorney.
Authorities say 77-year-old Ann Day was driving Saturday morning when Barnes' vehicle crossed the median and struck her car head-on.
The collision also led to a truck rear-ending Day's car. That driver was hospitalized for non-life-threatening injuries.
Paramedics transported Day to the hospital, where she was pronounced dead. The other two drivers, both male, were hospitalized with serious but non-life-threatening injuries.
Inglett said the Pima County Office of the Medical Examiner will determine the official cause of death.
Investigators were working to figure out what caused the first driver to cross the center line.
Day, the younger sister of O'Connor, often described herself as a "cowgirl from the Lazy B," referring to the southeastern Arizona ranch her grandfather established.
She served in the Arizona Senate for a decade and as a Pima County supervisor for 12 years, the Arizona Daily Star reported.
Day was known for being moderate politically and for advocating for cancer patients' rights to clinical trials and reforms in the HMO industry.