yussupov29,
I share your interest in Prince Dolgoruky as well as in almost all those associated with the Romanov Imperial Family. But there are several corrections that should be made to the statement of the topic itself. First, the man in question is Vasily Dolguruky, not Alexander Dolgoruky. Coincidentally, the years of his life are 1868-1918, exactly the same as Emperor Nicholas himself. I don't know the date of his birth but he is reported to have been shot to death just a week before Nicholas himself and his whole family and their servants. And by an assassin who stood just a few feet from the animals who shot up and bayoneted Nicholas, Alexandra, Alexei, and the four daughters.
In other words, it was not Yurovsky who killed Prince Vasily (known as "Valya" by friends and associates) but Grigori Nikulin. Nikulin led the Prince across a slightly wooded field under the pretext of having to reach a road or railroad beyond. This was why Dolgoruky was carrying a heavy suitcase with him. Nikulin shot and killed the Prince and , in a reported comment about the murder, our Grigori was quite irked to then have to lug the dead man's suitcase back across the field himself in order to obtain(steal) its contents.