Riley Strain, 22, was found dead in March, two weeks after he vanished during a night out with his friends in Nashville. His parents wept as they accepted his University of Missouri diploma on Saturday.
A forensic expert has claimed Riley Strain s pants would not have come off themselves but would have likely been removed by another person before he entered the river where he was found.
An initial police autopsy found no signs of foul play, but no signs that he drowned either, after leaving Luke s Bridge Food and Drink at 9.30pm on March 22.