The murder victims: Byrd and Melanie Billings were well known in the small town of Beulah, west of Pensacola, Fla. They were wealthy -- he owned several successful businesses. She was 43, he was 68. Search for the latest on the case.
The children: The Billingses adopted several special-needs children. In total, they had 17 kids, 13 adopted and four from previous marriages. Watch one of their older children, Ashley Markham, talk about her parents.
The house: The Billingses' sprawling nine-bedroom home was specially equipped so the couple could keep track of their many children. That system captured chilling images of the killers entering their home on July 9. Search for more on the videos.
The break-in and murders: Police say the killers drove a red van. (Who is accused of being behind the wheel?)
Video captured three suspects entering through the front door and two through the back. The killers were out of the house in less than 10 minutes. Nine kids were at home at the time, but unhurt.
Some of the suspects wore martial arts garb. What kind?
The motives: Likely robbery, say police. The killers took a safe, among other items, from the home. There may be other motives, though police won't comment further. (Search has more facts and motives behind home invasions.)
The arrests: Eight people have been arrested in connection with the murders. One had gotten publicity for these special skills, which he taught to kids. Another is in the military. Several others worked as day laborers, and one of them is only 16. A woman is the eighth person to be charged. There could be more.
The cop: The man who has been front and center in the investigation is getting some attention for his demeanor and sound bites. Bing finds Sheriff David Morgan in front of the cameras.
In cold blood: The murder of the Billingses has been likened to a famous incident in Holcomb, Kan., in 1959. In that case, members of a rural family were murdered by strangers.
The book about those killings, "In Cold Blood," was a best-seller in the mid-'60s. Its author was equally famous and rather quirky.