The Utah County attorney's office on Thursday charged a 16-year-old Las Vegas youth as an adult in connection with the death of a Fillmore man during a car chase Monday.

Steven Edward Floyd was charged before 4th Circuit Judge Robert J. Sumsion with manslaughter, a second-degree felony, and evading a police officer, a third-degree felony. Sumsion appointed public defender John Musselman to represent Floyd.Police officers were pursuing a vehicle at high speed Monday night when it struck a car driven by Boyd Day, 69, in a south Provo intersection. Day was killed and his wife, Mary Day, 52, seriously injured.

Payson police began chasing the car on U.S. 6 near Benjamin, then north on I-15, where police from several other agencies joined in. Speed of the chase exceeded 90 mph at times.

The car left I-15 at the University Avenue exit and, traveling an estimated 70 mph, hit several cars at the intersection of East Bay Boulevard, where Floyd was arrested. Police say Floyd had run away from a Las Vegas youth detention facility and is suspected of having stolen a car.

Musselman told Sumsion that he intends to file a petition to return jurisdiction of Floyd's case to juvenile court. Sumsion agreed to postpone the preliminary hearing until a ruling on that petition is made.