Возвращение Мухтара S11E07 - Таксист

Taxi driver Boris Kozlov had an argument with the driver of the SUV and was soon found in the grass with a gunshot wound. The detectives' work was complicated by the fact that on the same day Kozlov met with his friend Zhora Perepelkin, who had a gun. Friends intended to "hang out with vodka and girls," but Boris's wife Irina found out about it. Who shot the taxi driver?