At 1137 mountain time, a Robinson R22 Beta struck power lines and crashed near Dolan Springs. The pilot and passenger were killed. The flight originated from Las Vegas, Nev., at an unknown time. A witness said the helicopter was flying over his lane on Interstate 93 about 30 miles north of Kingman when it struck the power lines. Indications are that the wires were about 30 feet agl at their lowest point between poles.