 Complete the following phrase:  Popov was involved in a serious car accident on November 17, 2015, while returning from training near Sölden. He was one of two passengers in a vehicle driven by Drago Grubelnik, then head coach of the Bulgarian ski team, who was also accompanied by his assistant Mitko Hristov. All three occupants of the car were injured in the crash, with Grubelnik later dying of his wounds in a hospital in Murnau, Germany. Popov eventually returned to the FIS circuit for the 201617 season, and featured at the 