A body found in the Rhine river on New Year's Eve was identified on Saturday as that of former Ivory Coast footballer Steve Gohouri.
Dusseldorf police spokesman Marcel Fiebig said there were no indications that a third party was involved in Gohouri's death.
The body was found in the city of Krefeld, to the north west of Dusseldorf. The 34-year-old Gohouri had been reported missing on December 12.
Gohouri, a defender who played for the Ivory Coast between 2006 and 2009, scored two goals in 42 games for Borussia Monchengladbach between 2007 and 2009, helping the side to Bundesliga promotion in 2008.
He also played for Wigan in England and Young Boys in Switzerland.
"This is terrible news," Monchengladbach sporting director Max Eberl said. "I got to know Steve as a person full of the joys of life and that's how I'll remember him. Our thoughts and sympathies are now with his family."
Gohouri was playing this season for German fourth-tier side TSV Steinbach.