Gunmen shot dead a former K.G.B. agent turned basketball entrepreneur on Monday, law enforcement officials said.

The former agent, Shabtai von Kalmanovic, was shot in his car a few hundred yards from the office of Prime Minister Vladimir V. Putin, the officials said.

Mr. von Kalmanovic once organized a Michael Jackson concert in Moscow, and he helped two basketball clubs win Europe's top championship.

He died at the scene, the state prosecutor's office said.