Franklin County Judge William Alexander says he failed to allow specific testimony from an expert witness for the plaintiff, along with related portions from a training manual.
The second trial will focus solely on damages.
The Roanoke Times reports Alexander ordered the new trials on Friday.
Christie Altice-Weaver sued Teri Anne Valentine and the estate of Rocky Mount Fire Chief Posey Dillon. Valentine was driving a sport utility vehicle that collided with a fire truck in 2010 as Dillon and Altice-Weaver’s father, firefighter William “Danny” Altice, were responding to a call.
In September, a jury found Valentine negligent. The jury cleared Dillon of any negligence.