"The fact they were found in their bedrooms probably says that this was thought out in such a way as to be simple," Northrup said.
Northrup says Campbell could be someone who shouldered his burdens internally, which could be why investigators say the motive is still unknown. It's frustrating for everyone who knew the Campbells.
"They all had so much to offer this world. What is so bad that you get to that point? You just can't even fathom that," said neighbor Sheila Mauldin.
Northrup says he is not surprised that no note from Campbell has been found. He says it indicates that this was an attempt to leave no answer behind.
Campbell wanted to destroy everything... and he did.