It's good luck to say "break a leg" in the theatre... but on your wedding day? Not so much, I think. Horse Pulling 'Just Married' Cart breaks leg and dies. Police say the 23 year old horse died after the fall, but not "how". I'll tell you how. Mercy shot. Yeah, I'd say that would be quite traumatizing to the happy couple in the carriage. Poor thing. May you spend eternity rolling in endless fields of clover.