Ponchatoula Police Chief Bry Layrisson says authorities are awaiting a coroner's report and that it does not appear foul play was involved.
Layrisson says police were asked on Sunday to check on Derenbecker and found his body in the swimming pool of a home where he'd been house-sitting.
Derenbecker was twice named Gatorade Louisiana Player of the Year at Country Day High School in suburban New Orleans, but his career sputtered in college as he struggled with personal matters off the court.
After brief stints at LSU and Dayton, he began last season at UNO, but left the team in mid-season.
At LSU, Derenbecker averaged 6.5 points and 2.1 rebounds per game for the Tigers as a freshman, starting in 16 games.
He transferred to the University of Dayton, sat out the 2011-12 season because of NCAA transfer rules then played in for the Flyers in 2012-13. He averaged 4.5 points and 1.1 rebounds that season before electing to transfer to UNO.
He was granted a waiver by the NCAA to play in 2013-14. But in January of this year, he left the team because of undisclosed medical reasons.
Derenbecker was averaging 10.5 points and 5.6 rebounds per game in nine games before leaving the team.
The highlight of his season came in December when he scored 16 points in the Privateers' loss to then-No. 4 Michigan State in East Lansing.