Supreme Court dismisses appeal; work accident requires strict proof of external cause and work connection.

The Supreme Court dismissed the cassation appeal filed by Alicja K. against her husband's death, ruling that the Social Insurance Act does not override the parties' freedom to choose the legal nature of their contract. The court found that the husband died from a chronic heart condition without any external cause or exertion, failing to meet the strict statutory requirements for a work accident under the Work Accident Act. Consequently, the court held that the lower courts correctly determined the event was not a work accident, regardless of the contract's label, and rejected the claim for social insurance benefits.