Two shots took place in the Ascension and Livingston parishes, near Baton Rouge, Louisiana, on Saturday morning.
The suspect, 21-year-old Dakota Terriot, is charged with killing her parents, Elizabeth and Keith Terriot, both at 50 in Gonzalez.
Authorities sought Terio on Saturday and said they believed he was "armed and dangerous".
Last time they saw him run a gray and silver Dodge 2004 Dodge with a Louisiana registration number C583809, the authorities said.
The theorites were alive when the deputies arrived at home and were able to identify their son as an archer, "said Ascension Paris, Bobby Webber, to reporters.
"Dakota Terriot lives there for a short period but has recently been asked to leave the residence and not to return," Webre said.
Dakota Terio is also suspected of killing three more people in the Livingstone neighborhood. The victims, Billy, Summer and Tanner Ernest, were found dead on Saturday morning, the Sheriff's Office of Livingston said.
At least one of Livingston's victims was Terio's friend, the sheriff's officer said.
The suspect is charged with two charges of first-degree murder, illegal use of weapons and home invasion, Webre said.
Investigators are still trying to determine the shooting motive.