MOSCOW, January 23 - RAPSI. The counsel for the doctors killed in a high-profile car accident involving an oil company’s vice president have requested another expert investigation to get answers to their questions, Trunov, Aivar & partners reported on Monday.

An additional technical investigation in the case has failed to prove the guilt of the doctors who died in the accident. The defense attorneys learned the investigation results on January 19. They said the experts have only answered four of the 25 questions asked by the defense.

The attorneys believe that the latest examination results do not confirm the doctors' guilt.

They seek answers to 25 substantial questions about the cars’ movement, their collision details and the impact of the weather conditions.

A car crash involving a LUKOIL vice president's Мercedes S500,  occurred on February 25, 2010 in Moscow. The crash killed well-known gynecologist Vera Sidelnikova and her daughter-in-law Olga Alexandrina, who was also a doctor. Vice President Anatoly Barkov received only light injuries.

However, investigators concluded that Alexandrina caused the crash and later closed the case due to the defendant’s death.

The relatives opposed the case's termination and went to the Constitutional Court. The court decided that recognizing the deceased as guilty contradicts the presumption of innocence and ruled that the relatives of the deceased were entitled to insist on their vindication and object to the case's closure.

The investigative authorities resumed the pretrial investigation on July 28.