HEBER SPRINGS, Ark. — Two people were arrested in Cleburne County Saturday, accused of killing a pregnant woman in Oklahoma.

Joshua Finkbeiner, 30, of Morrilton and Staci Harjo, 42, of Oklahoma City each face two counts of first degree murder.

Oklahoma authorities found 23-year-old Shaliyah Toombs, a mother of two with a third on the way, dead in the back of a pickup truck off I-35 near Oklahoma City on May 2.

Prior to this weekend, another man had already been arrested in Oklahoma City as an accessory to Toombs’ murder.

Detective David Tompkins with the McClain County Sheriff’s Office says when they ran the tags on the truck they found Toombs in, it came back as belonging to Finkbeiner. Jail records show Finkbeiner works for an oilfield company that has offices in Oklahoma City.

“The information we had gotten was that he was probably en route back to Arkansas,” Tompkins said in a phone interview Monday.

After the truck discovery, a BOLO went out, warning Arkansas authorities the suspects could be in the area. Finkbeiner and Harjo were pulled over and subsequently arrested by Cleburne County deputies.

Investigators have yet to release how the two may know each other, or the pregnant victim.

In a brief conversation, Finkbeiner’s soon to be ex-wife told us she had no clue how her husband knew any of the individuals involved.

“This is a very complex and strange case,” Tompkins said.

Finkbeiner and Harjo were awaiting extradition to Oklahoma as of Monday night.

A medical examiner still has not determined exactly how Shaliyah Toombs died.