For the purposes of this article, a law enforcement officer means a:
(1) person performing law enforcement duties at the request of and under the supervision of an official state, municipal, or county law enforcement agency in South Carolina when the person is totally disabled or killed in the line of duty;
(2) person performing law enforcement duties at the request of and under the supervision of a federal agency when the person is totally disabled or killed in the line of duty if he has been a resident of South Carolina for at least eighteen years. This item applies whether or not the law enforcement officer was disabled or killed in South Carolina or another state.