The family of Riley Strain has ordered a second autopsy despite a medical examiner's findings there were no obvious signs of trauma to his body.

Strain family spokesperson Chris Dingman said Riley's loved ones are desperate for more information on the moments leading up to the University of Missouri student's death.

"The family deserves more answers than we have," Dingman said during an interview with NewsNation's Elizabeth Vargas Wednesday.

Strain, 22, vanished from a downtown Nashville bar during a visit with his college friends on March 8.

His body was found March 22 in the Cumberland River – eight miles from where he was last seen alive, following an intense, two-week search.

"The only thing that was found with him, as the police stated in the report, was the watch and the shirt," said Dingman. Strain was not wearing pants.

Strain's preliminary autopsy report suggested his death was accidental, as there was no evidence of foul play, investigators said, Headlines & Global News reported.

"I think there's somebody out there that knows what actually happened that night," said Dingman.

Meantime, Strain's funeral is set for Friday.