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Police said a man wearing a motorcycle helmet entered the house through an unlocked door on the 4500 block of Faria Beach Road and confronted Davina Husted in the kitchen at about 10:30 p.m.
Her husband, who was in a bedroom, heard the commotion and went to check on his wife. The suspect stabbed both of them multiple times in the torso
Both parents died at the scene.
Police said the victims' 9-year-old son witnessed the slaying at the beachfront home. The boy ran and woke up his 11-year-old sister, and they both ran to a neighbor's house.
Brock Husted's brother Scott Husted said the victims were a loving couple with no known enemies. He said he believes this was a random attack.
"There's no answers as to why this happened. It's a horrible situation. And there's a killer out there ... that killed a man and his wife -- his pregnant wife -- with two small children in the home," he said.
No one has been arrested.