Two were airlifted, Sadler said. He said he couldn't find his cellphone, so he used one of the children's phones to call 911.
The name of the deceased victim has not been made public as of Monday morning. "This is going to be a loss that's going to be hard to heal from".
Bobby White, a spokesman for the Achievement School District in Memphis, said students from five of the district's schools were in the bus that crashed.
The driver is alive and being questioned by state troopers.
"On behalf of all Memphians, our hearts and prayers go out to the Orange Mound children and their families involved in this morning's tragic bus accident in Arkansas", Memphis Mayor Jim Strickland said in a statement.
Saline Memorial Hospital admitted 13 injured adults and children, spokeswoman Rebecca Jones said.
KATVA charter bus heading carrying a football team from Dallas Texas to Memphis Tennessee crashed outside of Benton Ark. Dec. 3 2018
Memphis is roughly 130 miles (209 kilometres) east of Little Rock.
Arkansas state police confirmed one person died. It was traveling to Memphis, Tennessee when it left the road and rolled over, police said.
Three other hospitals also received patients, officials said. A family center has been set up to help parents reunite with their children. Authorities say as many as 40 people were injured, a lot of them children. They were treated for bruising, lacerations and some orthopedic injuries then released. The TV station reports the children are elementary-school age.
State police say the bus overturned after driving off the interstate.
At least 45 other people were injured when the bus tumbled down the embankment. The team played a championship game in Texas over the weekend and were headed home when the accident happened. The injured were taken to hospitals in both Benton and Little Rock.
"When troopers arrived at the scene, numerous children were already off of the bus", Sadler told CNN.