The Latin expression causa mortis designates the legal foundation or the biological and pathological event determining death. It possesses a multidisciplinary technical nature that spans Civil Law, Succession Law, Criminal Law, and Forensic Medicine, being essential for defining the transmissibility of rights, the determination of liabilities, and the opening of hereditary succession.
Concept and Foundation
The term causa mortis, within the national legal system, branches into two fundamental meanings: the biological-forensic meaning and the legal-succession meaning. From the perspective of Forensic Medicine, it refers to the pathophysiological phenomenon that culminated in the end of human life, which is essential for issuing death certificates and for criminal classification in crimes against life. Legally, the term qualifies the nature of asset transmission, distinguishing itself from inter vivos acts.
The legal nature of the causa mortis succession institute lies in the automatic and immediate transfer of the inheritance to legitimate and testamentary heirs, a phenomenon governed by the Principle of Saisine, enshrined in Article 1,784 of the 2002 Civil Code. Death is the legal fact that triggers the opening of succession, operating a subjective mutation in the ownership of the de cujus's legal relations.
Historical Origin and Evolution
The origin of the institute dates back to Roman Law, specifically under the aegis of successio, where the figure of the heir was seen as the continuation of the deceased's personality. Doctrinal evolution consolidated the distinction between gratuitous acts (mortis causa donations, equated to legacies) and onerous acts. In Brazilian Law, legislative evolution, from the Philippine Ordinances to the 2002 Civil Code, maintained the rigor regarding the need for documentary proof of the causa mortis for the effectiveness of property and social security rights.
Legal Provision and Practical Application
The Brazilian legal system establishes causa mortis as a prerequisite for several institutes:
- Civil Code, Art. 1,784: Establishes the opening of succession at the moment of death.
- Civil Code, Art. 546: Regulates donations made in contemplation of future marriage or by reason of death.
- Public Records Law (Law No. 6,015/1973), Art. 77: Determines the mandatory declaration of the cause of death for civil registration.
- Code of Criminal Procedure, Art. 162: Requires a necroscopic examination to determine the cause of death in cases of violent death.
Jurisprudence and Understanding of Superior Courts
The understanding consolidated in the Superior Court of Justice (STJ) reaffirms that proof of causa mortis is a sine qua non condition for the granting of social security death benefits (survivor's pension). Jurisprudence emphasizes that, in cases of presumed death, the absence of a body does not eliminate the need for robust circumstantial evidence of the cause of death (Theme 1,056/STJ).
Within the scope of the Supreme Federal Court (STF), the discussion on causa mortis gains prominence in matters of State civil liability, especially regarding failures in hospital service provision or state custody, where the causal link between the state action/omission and the cause of death must be unequivocally demonstrated (RE 841.526/RS).
Related Principles and Doctrinal Divergences
The institute is intrinsically linked to the Principle of Saisine and the Principle of Intangibility of the Legitimate Share. A relevant doctrinal divergence lies in the legal nature of mortis causa donations, with some currents equating them to wills (Clóvis Beviláqua) and others defining them as sui generis contracts, subject to specific revocation rules.
Contemporary Relevance
Currently, the debate on causa mortis has expanded to the field of Biolaw, notably regarding the distinction between brain death and clinical death for organ donation purposes (Law No. 9,434/1997). Precision in determining the cause is imperative for legal certainty in life insurance, private pension plans, and the criminal prosecution of homicides, femicides, and robberies resulting in death, where criminal classification depends on the correlation between the causative agent and the result of death.
Legal and Jurisprudential References
- BRAZIL. Law No. 10,406, of January 10, 2002. Establishes the Civil Code.
- BRAZIL. Law No. 6,015, of December 31, 1973. Provides for public records.
- STJ. REsp 1,845,000/SP, Rapporteur Min. Nancy Andrighi. Third Panel, judged in 2021.
- STF. Extraordinary Appeal (RE) 841.526/RS (Theme 592 - State Civil Liability).
- VENOSA, Sílvio de Salvo. Civil Law: Successions. 20th ed. São Paulo: Atlas, 2023.
