What if I killed or injured my spouse when I caught him/her in the act of committing sexual intercourse with another person?

The law provides that “any legally married person who, having surprised his spouse in the act of committing sexual intercourse with another person, shall kill any of them or both of them in the act or immediately thereafter, or shall inflict upon them any serious physical injury, shall suffer the penalty of destierro” (RPC, Article 247). The accused spouse, which could be the husband or the wife, must prove the following:

A legally married person (or a parent) surprises his spouse (or his daughter, under 18 years of age and living with him), in the act of committing sexual intercourse with another person.
He or she kills any or both of them or inflicts upon any or both of them any serious physical injury in the act or immediately thereafter.
He has not promoted or facilitated the prostitution of his wife (or daughter) or that he or she has not consented to the infidelity of the other spouse.
The accused must proved that he/she actually surprised the other spouse in flagrante delicto (or in the act of doing the deed), and that he/she killed the other spouse and/or the other party during or immediately thereafter.

Sources: Revised Penal Code; People vs. Nepomuceno, G.R. No. L-40624, 27 June 1975; Pilapil vs. Ibay-Somera, G.R. No. 80116, 30 June 1989; Ligtas vs. CA, G.R. No. L-47498, 7 May 1987; People vs. Puedan, G.R. No. 139576, 2 September 2002; People vs. Bastasa, G.R. No. L-32792, 2 February 1979

What is destierro?

Destierro means banishment or only a prohibition from residing within the radius of 25 kilometers from the actual residence of the accused for a specified length of time. It is not imprisonment.