The Pennsylvania Supreme Court has held that the driving under the influence violation must be the direct cause of death and that causation must be proven beyond a reasonable doubt.
Commonwealth v. Lenhart, 520 Pa. 189, 553 A.2d 909 (1989).
Christopher T. Lee,
Criminal Law - Homicide by Vehicle While Driving Under the Influence - Causation,
Duq. L. Rev.
Available at: https://dsc.duq.edu/dlr/vol28/iss4/14