My brother killed a thief who stole $800 from him. The thief drove away with his wallet and my brother chased after him. My brother then hit him from behind and the thief crashed and died. The thief was speeding at about 60mph and was not wearing a seat belt. My brother says he did not mean to kill the thief, but some people accused him of killing the thief in the heat of the moment. Is it a sin to kill a thief? Is it a sin to accidentally kill a thief? My brother says if he could take it back he would. Does that make him remorseful?