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Caskets, i'm having to buy burial plots. you know i've got all this stuff goin' on. >> reporter: three days after the murders, the indiana state police called david in for a second interview. he sat down with two cops he knew well. he'd been sharing coffee and cases with them for years. >> because of the high profile of this case and because obviously as you know, well, the notoriety, we're doing this all by the numbers. this time the tone of the interview had changed. because now, the investigators did have a working theory of the murders -- and the evidence they were gathering pointed to non...

Welcome back to "dateline extra." i am craig melvin. david asked investigators to do it right, and they had been his coworkers, some of them his friends and police interviewed him with care the first time around but they were about to bring him in again, and this time the mood would be decidedly different. here again is dennis murphy. >> reporter: in the days after the murders, two families, the lockharts, uncles, aunts, nephews, nieces, and kim's family were united in grief. >> we lost three wonderful people that we loved dearly. we don't have them with us today. >> kim, bradley, jill, just l...

U.s. is, quote, locked and loaded after drone strikes on two oil facilities in saudi arabia. trump also authorized a release of oil from a strategic petroleum reserve to offset those attacks and rising prices. now back to "dateline." >> reporter: in the days after the murders, two families, the lockharts, uncles, aunts, nephews, nieces, and kim's family were united in grief. >> we lost three wonderful people that we loved dearly. we don't have them with us today. >> kim, bradley, jill, just like that. gone. >> all gone. >> reporter: david was all but shutting down. >> i'm a mess. i'm on medica...

>> reporter: in the days after the murders, two families, the lockharts, uncles, aunts, nephews, nieces, and kim's family were united in grief. >> we lost three wonderful people that we loved dearly. we don't have them with us today. >> reporter: kim, bradley, jill, just like that. gone. >> all gone. >> reporter: david was all but shutting down. >> i'm a mess. i'm on medication. you know, i'm having to buy caskets, i'm having to buy burial plots. you know i've got all this stuff goin' on. >> reporter: three days after the murders, the indiana state police called david in for a second interview...

>> reporter: in the days after the murders, two families, the lockharts, uncles, aunts, nephews, nieces, and kim's family were united in grief. >> we lost three wonderful people that we loved dearly. we don't have them with us today. >> kim, bradley, jill, just like that. gone. >> all gone. >> reporter: david was all but shutting down. >> i'm a mess. i'm on medication. you know, i'm having to buy caskets, i'm having to buy burial plots. you know i've got all this stuff goin' on. >> reporter: three days after the murders, the indiana state police called david in for a second interview. he sat d...