PENSACOLA (AP) – An ex-convict who taught self-defense to children. A day laborer who served prison time for killing a man in a fight. An Air Force staff sergeant attached to an elite special operations unit.

Somehow, authorities say, they ended up part of a loosely connected group of seven men charged in the shooting deaths of Byrd and Melanie Billings, a wealthy Florida Panhandle couple known for adopting children with special needs.

The suspects, some dressed as ninjas, stole a safe and other items during the break-in Thursday at the sprawling Billings home west of Pensacola. Nine of the couple’s 13 adopted children were home at the time. Three saw the intruders but were not hurt. Authorities would not say what was in the safe or what else was taken.

Some of the masked men entered through the front door, while others slipped in through an unlocked utility door in the back. They were in and out in under 10 minutes. The crime was captured by an extensive video surveillance system the Billings used to keep tabs on their many children.

“It was a very well-planned and well-executed operation,” said Escambia County Sheriff David Morgan.

The last three of the seven suspects were arrested Tuesday, though Morgan said there still might be more arrests. State Attorney Bill Eddins said robbery was the main motive for the crime.

Adult daughter Ashley Markham – one of four Billings children from previous marriages – sobbed Tuesday as she hugged Morgan, who said he kept a promise made to her the night of the slayings.

“It is my honor today to tell you, Ashley, your family we have found them and they are in custody,” Morgan said.

The suspects ranged in age from 16 to 56, and several were day laborers who knew each other through a pressure washing business and an auto detailer they worked for. One, Donnie Ray Stallworth, was with the Air Force Special Operations Command with an aircraft maintenance squadron at Hurlburt Field near Fort Walton Beach. It wasn’t clear how he knew the others.

“We’re dealing with a group of folks with rare exception – of course, there’s a couple of people who are not – that again are basically day laborer sorts, folks that get odd jobs, part-time jobs and they drift,” Morgan said. “With the exception of Mr. Stallworth you don’t have any career-minded people in this group.”