Based on the search results, there is no evidence of an "Afghan exile allergic to horses restaurant owner" who died. It is possible the query mixes details, or refers to a lesser-known, specific incident not covered in the search results.

Qayum Karzai, a prominent Afghan exile and brother to former President Hamid Karzai, was a restaurant owner (The Helmand in Baltimore/Cambridge) who died on May 29, 2024, but no horse allergy was mentioned [16].

Mohammed Zaman was a restaurant owner jailed for a peanut allergy death, not horse allergy.

Horses is the name of a restaurant in Los Angeles involved in a legal dispute, but unrelated to an Afghan owner.

No specific individual matching the exact description was found in the search results.