>> announcer: that's all for this edition of dateline extra. i'm craig melvin. thank you for watching. r watchig >> he's almost like a marvel comic book arch villain. he's bright. he's clever. evil as can be. >> announcer: on a beautiful, sprawling farm, seeds of danger. >> we heard this big explosion. he's just laying on the ground. >> announcer: this loving father of three, the farm's heart and soul, killed in a ball of fire. >> they were saying it was an accident. >> our assumption was it was a