Kozachenko and his Ukrainian teammate Volodymyr Yermakov, 17, were attacked in Dusseldorf by another group of teenagers on Feb. 12. Yermakov died at the scene from stab wounds. Read also: German police identifies teen murderer of Ukrainian basketball player After the attack, Kozachenko was placed in intensive care and underwent several surgeries. His condition deteriorated significantly over the past few days, and doctors were unable to save him, the team said. Ukrainian Foreign Ministry spokesperson Oleh Nikolenko said that German police had arrested Yermakov’s killer. The suspect is identifi…