Police believe the suspect walked into the home through an unlocked French door, attacking Davina Husted in the kitchen.
Her 9-year-old son reportedly saw the suspect enter the home, woke up his 11-year-old sister and ran to a neighbor's house.
Brock Husted was killed when he came to the aid of his pregnant wife.
Sheriff's department investigators say they are still sifting through a lot of evidence, but with the killer still at large, they say they don't want to release any more information.
Neighbors are still on edge.
"I think everybody will breathe a sigh of relief if we get an answer about what happened, who it was and why it happened," said Harry Palmer, who lives in Faria Beach.
According to a newspaper report, investigators have served several search warrants in the case, but no possible suspects have been named.