The two allegedly killed Lisa Spinks, whose body was found on railroad track on Sunday, Sept. 25.
Arrest warrants said the two men admitted to the vicious crime.
According to the Montgomery County Coroner's Office, Spinks had been stabbed and then placed on the tracks.
At the two men's arraignment last week, the Spinks' grandmother, JoAnn Shields, asked, "Why? What did she do so wrong?"
Spinks' aunt, Teresa Kilpatrick, said "How could he do something that evil to such a sweet and beautiful young woman?"
According to court documents, both Sellers and Shaffer took Spinks to the railroad track near Bear Creek, but the preliminary investigation says Sellers was the one who murdered her.
"She was just starting her life and he just snuffed it out like it was nothing," Kilpatrick said.
Shields said, "What could be so bad ya know that they would do this intentionally, or from what I gather, intentionally?"
Not guilty pleas were entered by the judge on behalf of both men.
Bond was set at $1 millions apiece.
Prosecutors said they will seek the death penalty if the cases against the two men go to trial.
A search conducted at the homes of Sellers and Shaffer uncovered knives, cell phones, weapons, clothing and an ID belonging to Spinks, according to a search warrant affidavit.
According to the search warrant, Spinks had recently ended a relationship with Shaffer.
The affidavit stated Shaffer told police he hadn't seen Spinks in awhile. Police then wrote that Shaffer claimed he was with her on the train trestle when he said she jumped off.
The report said he revised his story again, pointing the finger at Sellers, saying they joked about killing Spinks before Shaffer invited her and Sellers over Saturday night.
They walked down to the train tracks where Shaffer told police he saw Sellers with Latex gloves and knew they were going through with it.
Shaffer claimed Sellers hit her in the head multiple times with a rock, then dragged her body and placed her on the tracks, the report said.
Police said Spinks' body was hit at least twice by trains overnight before a CSX train crew found her severed in two pieces.
Police said Sellers pointed the finger at Shaffer.
An autopsy performed by the Montgomery County Coroner on Tuesday said the official cause of death is multiple stab wounds.
Susan Howard, who lives down the street from Sellers, said the cold brutality of the murder is heartbreaking.
"I want justice, whichever way that comes out. We want to see justice come out," Howard said. "It's very disturbing. We're just living in a very disturbing time. There's no value to life to a lot of people."
Police are continuing their investigation, including looking at video from CSX and the preliminary autopsy results.
A Montgomery County grand jury has indicted two men who are accused of killing a Miamisburg woman and then leaving her body on train tracks to cover it up.
Josh Sellers and Jamie Shaffer each were indicted Wednesday on the following charges: two counts of aggravated murder, kidnapping, two counts of tampering with evidence, gross abuse of a corpse and possessing criminal tools.
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