Is it true you can shoot your wife's lover if you catch them "in the act?"

This is commonly referred to as the "paramour law," which referred to article 1220 of the Texas Penal Code. Article 1220 was repealed in 1973 by Senate Bill 34 during the 63rd Regular Session of the Texas Legislature. Prior to its repeal, article 1220 of the Texas Penal Code read as follows:

Homicide is justifiable when committed by the husband upon one taken in the act of adultery with the wife, provided that the killing takes place before the parties to the act have separated. Such circumstance cannot justify a homicide where it appears that there has been, on the part of the husband, any connivance or assent to the adulterous connection.