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Sheriff Webre said during a press conference that a 911 dispatcher received a call around 8:45 a.m. about the two shootings, the victims of which were Theriot's father, Keith Theriot, 51, and his wife Elizabeth Theriot, 51.

Shortly after the first call, the Livingston Parish Sheriff's Office received a call at 9 a.m. about a homicide involving multiple victims. Those victims, according to a Facebook post from the Livingston Parish Sheriff's Office, were Billy Ernest, 44, and two of his children -- Summer Ernest, 21, and Tanner Ernest, 18.

Summer Ernest had recently started dating Theriot, according to her relatives.

Webre called the first incident a case of domestic violence and said that Dakota Theriot was recently asked to leave the residence and not return.

\"It's been a long time since we've had anything of this magnitude when it comes to domestic violence,\" Webre said during the news conference. \"We don't know the relationship between the father, the mother and the son at this time.\"

\"PHOTO:
Richmond County Sheriff’s Office
PHOTO: Dakota Theriot in an undated photo.
>

The Ernest family's two youngest children -- ages 1 and 7 -- were unharmed in the shooting. Neighbor Charlene Bordelon told The Advocate she called 911 after the children told her that their father, brother and sister were dead.

\"She was terrified,\" Bordelon said of the little girl, the newspaper reported. \"It's so heartbreaking.\"

Bordelon and her husband said moments before the children knocked on their door, they heard a truck speed away from the home.

Crystal DeYoung, victim Billy Ernest's sister, said in an interview with The Associated Press that she believed Theriot had just begun to date her niece, Summer Ernest -- who was also killed.

\"My family met him last weekend at a birthday party and didn't get good vibes from him,\" DeYoung told the AP. She said she wasn't sure how her niece and Theriot met, but that she believed the relationship was relatively new.

\"My mom is a good judge of character and she just thought he was not good,\" DeYoung said of Theriot.

URGENT MANHUNT: A manhunt is underway in Louisiana for Dakota Theriot, a 21-year-old male suspect on the run and accused of killing five people including his own father; police say he's armed and dangerous. @TomLlamasABC reports. #TheIndex https://t.co/sZkKoIoG4e pic.twitter.com/4y3H7SziRv

— World News Tonight (@ABCWorldNews) January 27, 2019

DeYoung said she skipped the birthday party and didn’t meet Theriot herself.

She identified victims Summer and Tanner Ernest as two of Billy’s three children. He was also raising his wife's children.

Webre said Theriot had been driving a 2004 Dodge Ram pickup truck that belonged to his girlfriend's father, Billy Ernest.

Prior to Theriot's capture, Webre described the suspect as an \"armed and dangerous guy\" and warned that anyone who came in contact with him \"could be a target.\"

In a previous run-in with the law in 2017, Theriot was asked to exit his vehicle during a traffic stop but instead drove off, throwing suspected marijuana out of the vehicle. When he was arrested, police found marijuana and paraphernalia in his possession, according to the St. Charles Parish Sheriff's Office.

ABC News' Stephanie Ramos, Anthony Rivas and Chris Francescani contributed to this report.

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