he s dead. i had to do it. he was gonna hurt my mom. reporter: the father is shot because the boy feels his mother s in jeopardy? yes. reporter: it was getting late on a frigid february night. the deputies put the son and the mother in a patrol car. and they asked him where the shotgun was. he told them or there was some mention of it bein in in the garage. reporter: after securing the weapon, the deputies made their way into the home. on the second floor, in the home office, they found their victim. the husband, the father s behind the desk? he s behind the desk. the spent shotgun shells are all right there in that doorway area. reporter: the detective would quickly learn more about jim tan father, husband and businessman. he owned his own company. they had lived in canada and then moved to the united states some years earlier. successful every day. executive, huh? by all accounts, yes. reporter: but was the successful businessman also an abusiv