[cnn-photo-caption image=http://i2.cdn.turner.com/cnn/2009/CRIME/07/20/florida.slain.couple/art.family.pnj.jpg caption="Byrd and Melanie Billings, known for adopting special-needs children, were laid to rest Friday."]
Susan Candiotti and Ross Levitt
Police expect to reveal another motive this week in the killing of a wealthy Florida couple known for adopting special-needs children, the local sheriff said.
Byrd and Melissa Billings were fatally shot July 9 in their sprawling home in Beulah during a home invasion robbery. Nine of their adopted children were in the house.
A safe containing prescription medication, family documents and some jewelry was taken from the home, Sheriff David Morgan of Escambia County said.
Morgan told CNN that he wants to talk to three more persons of interest and plans to make at least one more arrest before he winds down the investigation in a few days.
He did not provide further details.
Morgan said that he expects to interview the wife of suspect Leonard Patrick Gonzalez Jr. on Monday. The woman, who had been out of contact, asked police for a meeting, he said.
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