Investigators said Thursday the investigation into a the death of three people – an adult and two small children – who died when their car plummeted into the Mississippi River is complete and that they have ruled the case accidental.

Tunica County Sheriff’s Office personnel announced their findings Thursday.

The case gripped the hearts of Mississippians for days beginning on Sunday, Sept. 8, when witnesses saw an SUV driven by 29-year-old Symphony Wilson drive off the road and down an embankment into the Mississippi River. Witnesses said the vehicle floated down the river for a short distance before it submerged.

Neither Wilson or the two small children – who belonged to a friend of Wilson’s – ever emerged from the river.

Authorities searched for days, eventually finding Wilson’s body still inside the vehicle.

The children, 5-year-old Brenilah Moore and 2-year-old Cortez Moore were found days later in the river.

Sheriff’s investigators say the causes of death for all three deceased persons was drowning.