This documentation is a bit dated, but still recommendable for a watch:
Once Brothers is a documentary by ESPN and tells the story of the relationship between two famous basketball players from the former Yugoslavia: Vlade Divac (Serbia) and Dražen Petrovic (Croatia).
They were once as close as brothers, but the war in former Yugoslavia tore them apart, so their friendship broke. In 1993 Drazen Petrovic then died in a car accident in Germany and was buried in Zagreb. This tragic event prevented the reconciliation of the once good friends forever.