Mr. Justice Clark
delivered the opinion of the Court.
This is a diversity case for wrongful death of petitioner’s decedent, who was killed when a tractor-trailer leased by respondent crashed off a Pennsylvania highway. The action was tried to a jury on a negligence theory and judgment went for petitioner. 161 F. Supp. 875. The Court of Appeals reversed, finding that under Pennsylvania law the decedent was an employee of respondent and that the Pennsylvania Workmen’s Compensation Act, Purdon’s Pa. Stat. Ann., 1952, Tit. 77, provided the exclusive remedy. 257 F. 2d 445. We granted certiorari, 358 U. S. 927, on the question whether, in the light of Byrd v. Blue Ridge Rural Electric Cooperative, Inc., 356 U. S. 525 (1958) (decided after this case was argued, in the Court of Appeals), the matter of the relationship of the decedent to respondent was a jury question. We have concluded that Byrd does control that issue and that the judgment must therefore be reversed.
Respondent is an interstate motor carrier of freight certificated under the Interstate Commerce Act. It had leased a tractor-trailer, complete with driver,, from one Fidler, an' independent contractor. Its lease contract, which had been in effect for four years, required Fidler to furnish the driver as well as to keep the leased equipment in repair. In this connection the evidence indicates that Fidler had authorized his driver, where circumstances required, to hire services and purchase necessities on trips of this kind. • The vehicle and driver leased by respondent were en route from Syracuse, N. Y., to Midland, Pa., with 36,000 pounds of steel'when the mishap leading to