NAMPA -- As the search for clues in the killing of 37-year-old Selena Dawn Thomas continues, detectives have narrowed their sights on the woman's boyfriend as the main suspect in the killing.

Alfredo Martin Martinez, 39, has not been charged in connection to Thomas' death. He is being held in the Canyon County Jail without bond on a parole violation after turning himself in to police.

Also behind bars are three men accused of helping the killer: Jose Cruz Flores, Daniel Franscisco Sena and Jorge Luis Garcia were arrested Wednesday night and charged with aiding and abetting murder and failure to report a death. Flores and Sena are also charged with destroying evidence.

Prosecutor Bryan Taylor said the men will likely be charged as accessories after the fact, meaning they're not accused of helping to kill Thomas.

"My office will be reviewing those cases, determining what the appropriate charges are and we will be presenting those criminal complaints this afternoon to a Canyon County magistrate," he said. The trio of suspects are being arraigned Thursday afternoon.

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Police said they have not yet found Thomas' body, but the coroner and cadaver dogs have arrived at the crime scene off Can Ada Road south of Melba, where a section of a field is cordoned off and investigators have begun to dig. It is one of several crime scenes with physical evidence, Nampa Police Chief Craig Kingsbury said.

But even without a body, police are certain Thomas is dead.

"The focus of this switched late last night from a missing persons case to an aggravated battery case and then to a homicide case," Kingsbury said.

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Police began looking for Thomas Monday, after a worried family member reported they hadn't heard from her in several days. She was last seen Friday just after noon.

"That was the last time, we believe, that anybody else except for the person responsible for her death saw her alive," Kingsbury said.

Law enforcement officials said domestic violence played a role in her death, although the exact cause of death has not been released. Kingsbury referenced Thomas' young son as he urged people to take violent relationships seriously and seek help.

"This is not just a television show, this is not just a criminal investigation: This is a tragedy," he said. "A young man will go through the rest of his life without a mother, because of what happened to her, because of domestic violence."

Investigators continue to comb through the field.

"This is a very extensive-type crime scene, so we have to be very careful about how we collect evidence. We're taking our time on this," Sgt. Joe Ramirez said. "We want to do the best work we can for Ms. Thomas' family."

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