The suspect, James Michael Bowden, 32, took shelter in the home, about 5 miles southwest of the small city of Dardanelle after the deputy was shot, police said.
The state police issued a news release Friday identifying them as 61-year-old Rita Miller and 17-year-old Ciera Miller.
"Lieutenant Mainhart's 25-year career in law enforcement in West Memphis and Yell County made Arkansas a safer place".
Authorities later discovered two more bodies at the location of the disturbance call and believe the victims are linked to Mainhart's fatal shooting. He was gunned down early Thursday during the traffic stop. The idenities of the two civilians found dead and the suspect have not been released. Bowden was arrested following a standoff with police. "We didn't expect anything of this caliber to happen", Julie Bowden Inmon told the station. Doctors and authorities have not confirmed that. He says Bowden released a woman who was apparently being held hostage before he surrendered. Authorities have not identified those people.More news: Awards for Celtic's Brendan Rodgers and Scott Brown
Lieutenant Kevin C. Mainhart, 46, of the Yell County Sheriff's Department was killed in the line of duty today during a traffic stop west of Dardanelle, Arkansas along State Highway 27 near the junction of Slo-Fork Road. As of 2:55 p.m., the suspect has been taken into custody. Following his retirement, Mainhart joined the Yell County Sheriff's Department where he had been for five years. Mainhart recognized the vehicle from an earlier advisory associated with a disturbance call at the Gum Springs Road property.
The deputy was found by a passerby, who notified police.
Family has confirmed the identities of two females killed in Thursday's triple-homicide that also left a local deputy dead.