Theriot is wanted for at least two counts of first-degree murder, illegal use of a weapon, and home invasion in connection to both shootings.
'He lived there with the mom and dad for a little while, but was recently asked to leave with some disagreements, ' Ascension Sheriff Bobby Webre said.
Livingston sheriff Jason Ard confirmed in a statement that three people were killed in his parish and identified the victims as Billy Ernest, 43; Tanner Ernest, 17; and Summer Ernest, 20. Authorities believe the two incidents are related.
Authorities believe Theriot, who they said is armed and risky, might be heading to MS in a 2004 Dodge Ram pickup truck with license plate number: C583809, WAFB-TV reported. She told The Associated Press that she believes Theriot had just started dating her niece, Summer Ernest.
The first three victims were found inside a mobile home in Livingston parish, Louisiana, US, on Saturday morning. "They trusted people too much", she said, as she began crying. She said she met Theriot only once.
Among the victims are the suspect's parents, Elizabeth and Keith Theriot, both 50.
Dakota Theriot was the "prime suspect" in the deaths. Dakota Theriot is reportedly driving a 2004 Dodge pickup truck.
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Shortly after the first call, the Livingston Parish Sheriff's Office received a call at 9 a.m. about a homicide involving multiple victims.
According to the neighbor, Charlenne Bordelon, Theriot had been living with the Ernest family for a few weeks. She believed Theriot had stolen Billy Ernest's truck. He was also raising his wife's children.
"There's a lot of family members that are hurting right now and our prayers go out to those family members.they're looking at us to solve this crime", Webre said.
Webre said that officers were able to identify the suspected gunman after speaking with Keith Theriot before he died.
Police said his dad was still alive when they arrived at the house and claimed Dakota was the gunman.
"I would not approach this vehicle", he cautioned the public. When he was arrested, police found marijuana and paraphernalia in his possession, according to the St. Charles Parish Sheriff's Office.