Palm Beach Gardens police now say a woman and two juvenile males were stabbed Monday morning in the city and one of the juveniles is deceased.
The incident happened just before 6 a.m. at 334 Sunset Bay Lane in the BallenIsles community.
Police said when they arrived a suspect had barricaded himself inside the residence.
A SWAT team was called and they were able to take the person into custody.
A juvenile was pronounced dead at the scene and the other two victims were transported to St. Mary's Medical Center. They were last listed in serious condition.
Police said this was not a random act of violence and all the people involved were acquainted.
The suspect was a guest at the house.
Police have not released the names of the attacker or the victims.