The trial court found that the aggravation of an underlying physical condition did not fall within the coverage of the statute and plaintiff was thus not entitled to a line-of-duty disability pension. In reaching its decision, the court relied upon People ex rel. Cazel v. Board of Trustees (1943), 317 Ill. App. 585, 47 N.E.2d 536, a case which addressed a similar issue but which has not since been cited by the Illinois courts. Plaintiff argues the court erred in its interpretation of the statute.