Allows for a cause of action for alienation of affection

Missouri's HB 1874 creates a new legal claim allowing a person to sue a third party (like a romantic rival) for intentionally causing their spouse to leave the marriage. This law directly affects married individuals whose spouses have left due to the actions of a third person. The bill specifies that such lawsuits must be filed within three years of the alleged harmful act and can only be brought against natural persons (individuals, not corporations). It does not change existing laws about divorce or spousal relationships but adds a new civil remedy for interference.