BULLHEAD CITY, Ariz. -- Students at a high school in Bullhead City are mourning the loss of a teacher killed in a hit-an-run accident Wednesday.

Bullhead City police said Larissa Jean Castilleja, 43, was killed when a vehicle hit her as she was riding her bicycle on the Bullhead Parkway. Police said the driver kept going after hitting Castilleja.

Police spokeswoman Emily Montague said officers impounded a 1983 green GMC van.

They also arrested Gino Salvatore Gagliardi, 53, of Fort Mohave. Gagliardi was arrested on suspicion of leaving the scene of a fatal accident.

Montague said the vehicle had front-end damage, a flat tire and paint transfer from the bicycle.

Afternoon classes at Mohave High School were canceled Wednesday but resumed Thursday.