Two shootings took place in Ascension and Livingston parishes, near Baton Rouge, Louisiana, on Saturday morning.
A spokesperson for the Livingston Parish Sheriff's Office told the Huffington Post that police suspect Dakota may have killed the three people in Livingston before heading to his parents' nearby home.
WAFB reports that the Ascension Parish shooting was the one in which the suspect allegedly killed his own parents.
The sheriff identified the deceased as Elizabeth and Keith Theriot and said their son, Dakota, was the "prime suspect in this case".
The suspect is wanted for first-degree murder, illegal use of weapons and home invasion. DeYoung said Summer and Tanner Ernest were two of Billy's three children.
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Crystal DeYoung is Billy Ernest's sister. She said she wasn't sure how her niece and Theriot met, but that she believed the relationship was relatively new.
DeYoung said her brother, niece and nephew were good people.
Authorities reportedly believe these shootings are connected.
Authorities say a shooting in Louisiana has left five people dead and the gunman is still at large.
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Another shared post says, "I don't care what people say about me I know who I am and I don't have to prove anything to anyone".
Ascension sheriff's spokeswoman Allison Hudson says authorities believe the shootings in the two parishes are connected, and investigators from both jurisdictions are working together.
"This is probably one of the worst domestic violence [incidents] I've seen in quite a while", Ascension Sheriff Bobby Webre said during a press conference Saturday afternoon.
Webre said that during the course of their investigation, he learned that the Livingston Parish Sheriff's Office was investigating a triple-homicide that occurred on Saturday.
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