w ckba to dateline welcome back to dateline, i'm natalie morales.id that he shot his wife by accident. he even took a lie detector test. but the wealthy widower's behavior in the weeks after diane's death was raising eyebrows. did techs want his wife dead? it was a question that would haunt diane's friends and leave investigators to a potential motive for murder. once again, here's josh mankiewicz with deadly detour. >> with police investigating, rumors flying and even old friends becoming suspicious, tex mciver seemed to be doubling down. about two-and-a-half months after diane was killed, tex put her furs, clothes and jewelry up for sale. even though his friend sheriff sills told him, bad idea. >> i said, tex, this doesn't -- that doesn't look good. i mean if you don't have to do this right now, don't do it. >> but he did. >> never met a mannequin she didn't like? >> that's right. [laughs] >> auction house owner robert ailers ran the sale and even he was impressed. >> how many pieces total. >> there were over 100 jewelry items, not costume, but re