( CNN ) -- The driver in Thursday 's bus crash in Texas was investigated but not indicted in a fatal accident 15 years ago , according to court documents . Two people were killed and dozens rushed to hospitals after a charter bus bound for Oklahoma overturned on a Dallas-area turnpike Thursday morning . The driver is 65-year-old Loyd Rieve , the Texas Department of Public Safety said . He was investigated in a 1998 accident , but a grand jury declined to indict him on a charge of criminally negligent homicide . In that accident , Rieve was driving a bus that ran over a good Samaritan helping at an accident scene . 2 killed in Dallas-area bus crash . The bus driver was injured in the Thursday accident , which occurred on the President George Bush Turnpike in Irving . It involved only one vehicle . Department of Public Safety spokesman Sgt . Lonny Haschel told CNN the bus went off the right side of the road , hit a barrier , swerved left across lanes of traffic and struck a concrete median in a grassy area . `` It rode up on top of that concrete barrier , and then rolled on its right hand side , where it came to rest , '' Haschel said . The bus , owned by Dallas-area charter company Cardinal Coach Line , was taking passengers to Choctaw Casino in Durant , Oklahoma , the department said . Haschel said it 's too early to determine a cause . Investigators are looking at several factors , including the vehicle and physical evidence on the road . The National Transportation Safety Board said it has sent two investigators to the scene of the wreck . `` It 's going to be a lengthy investigation , '' Haschel said . CNN 's Joe Sterling contributed to this report .
A grand jury declined to indict him on a charge of criminally negligent homicide 15 years ago . The driver was killed in the Thursday accident . The car was driven to an Oklahoma casino . The state has sent investigators to the scene .