What crime has been committed when a woman receives a threatening letter from her ex-husband?

The crime committed in this scenario aligns with stalking because it involves a pattern of threatening behavior from the ex-husband towards the woman. Stalking is characterized by a repeated and unwanted pattern of behavior that causes someone to feel fear or distress. The receipt of a threatening letter indicates that the ex-husband is attempting to exert control or instill fear in the recipient, which is a key element of stalking behavior.

While harassment refers to unwanted and intrusive actions that cause distress, stalking specifically emphasizes the repetitive nature of such behavior and the impact it has on the victim's psychological well-being. Threatening behavior pertains to specific actions that could manifest as threats, and domestic violence typically involves physical abuse or the threat of physical harm within a domestic setting. In this case, the ongoing nature and the intent of the contact signify stalking more accurately than the other definitions provided.