In Tonkovic v. Retirement Board of the Fireman's Annuity & Benefit Fund, 282 Ill. App. 3d 876, 668 N.E.2d 1126, 218 Ill. Dec. 294 (1996), a firefighter suffered a heart attack while fighting a fire, was granted duty disability benefits, and never returned to work. Tonkovic, 282 Ill. App. 3d at 877. Fourteen years later he suffered another heart attack and died. Tonkovic, 282 Ill. App. 3d at 878. When his widow applied for pension benefits, the Board denied her application for widow's duty death benefits under section 6-140 of the Pension Code, and instead awarded her ordinary widow's benefits. Tonkovic, 282 Ill. App. 3d at 878. The widow filed a complaint for administrative review, and the circuit court set aside the Board's decision. Tonkovic, 282 Ill. App. 3d at 879. On appeal, the Board argued the widow was not entitled to section 6-140 benefits because she failed to prove her husband's death resulted from his performance of an act or acts of duty. Tonkovic, 282 Ill. App. 3d at 879. This court rejected the Board's argument and held that the plain language of section 6-140 "provides that a surviving spouse is eligible for section 6-140 benefits if the decedent firefighter's performance of an act or acts of duty prevented him from resuming active service until his or her death." Tonkovic, 282 Ill. App. 3d at 880. The Court stated that the dispositive issue is "whether the firefighter is injured due to an act or acts of duty and then dies without having returned to active service." Tonkovic, 282 Ill. App. 3d at 880. The Tonkovic court construed section 6-140 of the Pension Code and found: "A surviving spouse is eligible for duty death benefits if the decedent firefighter's performance of an act or acts of duty prevented him from resuming active service until his or her death. Under this clause it is irrelevant to the question of eligibility for widow's duty death benefits whether decedent's 1980 heart attack resulted directly in his death 14 years later. Rather, the focus is whether the fire fighter is injured due to an act or acts of duty and then dies without having returned to active service." Tonkovic, 282 Ill. App. 3d at 880.