Id. We will not reweigh evidence or substitute our judgment for the credibility determination of the WCJ. Stiner v. Workmen's Comp. Appeal Bd. (Harmar Coal Co.), 647 A.2d 981, 984 (Pa.Cmwlth. 1994). This court's duty is to determine whether the evidence accepted by the WCJ is sufficient to support his decision.
It is not necessary to show that the occupational disease was the sole or direct cause of death, but it is not sufficient to show that the disease was merely a contributing factor. Stiner v. Workmen's Compensation Appeal Board (Harmar Coal Co.), 647 A.2d 981 (Pa. Commw.), petition for allowance of appeal denied, 539 Pa. 698, 653 A.2d 1235 (1994). In light of these principles, it is clear that Claimant's argument is misplaced. Claimant argues that Employer did not produce unequivocal medical evidence defeating her claim.
Where both parties have presented evidence in a workers' compensation case, our scope of review is limited to the determination of whether an error of law has been committed, whether constitutional rights have been violated, or whether necessary findings of fact are supported by substantial evidence in the record. Section 704 of the Administrative Agency Law, 2 P. S. ยง 704; Stiner v. Workmen's Compensation Appeal Board (Harmar Coal Co.), 167 Pa. Commw. 264, 647 A.2d 981 (1994), petition for allowance of appeal denied, 539 Pa. 698, 653 A.2d 1235 (1994). Although we agree with the Board that it is possible to make a final adjudication with the facts as found in the first two Referee's decisions, we are precluded from doing so here. A decision of a WCJ that does not dispose of all claims or of all parties is interlocutory.