someone mentioned if cops have publicized ordered of killing. They have not.
But they probably do know based on 1) for want of a better word, inoculation, of each victim with prior victims blood. One victims wound, victims number one, will only have their won blood in and around wounds/s, while victim two would have their own and victims ones, and so on for victims three and four; and 2) blood trail of drops of blood from knife, also would start with one vics blood, and then be two vics blood, and then three and four victims blood comingled.