(1) A person is unworthy to inherit:
1. If they have intentionally and unlawfully killed or attempted to kill the deceased, or has put the deceased in a state as a result of which the deceased was incapable until their death of making or revoking a disposition mortis causa,
2. If they have intentionally and unlawfully prevented the deceased from making or revoking a disposition mortis causa,
3. if they have, by deceit or unlawfully by duress, induced the deceased to make or revoke a disposition mortis causa,
4. if they are, in respect of a disposition mortis causa made by the deceased, guilty of a criminal offence under the provisions of sections 267, 271 to 274 of the Criminal Code (Strafgesetzbuch).
(2) In the cases governed by subsection (1) nos. 3 and 4, unworthiness to inherit does not occur if, before the occurrence of the devolution of the inheritance, the disposition that the testator was induced to make or in respect of which the criminal offence was committed has become ineffective, or the disposition which they were induced to revoke would have become ineffective.