MOUNTAIN HOME - Detectives with the Elmore County Sheriff's Office and Idaho State Police have arrested a man on a first-degree murder charge.

The detectives served an arrest warrant on Scott Eugene Riggs at about 7:30 Friday night.

The arrest came six days after 71-year-old Paula Knudson Ferbrache was found dead in the trunk of a car along a dirt road northeast of Mountain Home. Ferbrache was reported missing the night of August 25, five hours after she got off work at the Walmart store in Mountain Home.

Sheriff Mike Hollinshead says the investigation is still ongoing.