Two people are behind bars and police are searching for a third tied skeletal remains found in North Tulsa in December.
That's when Charles Johnson was arrested. Tuesday, arrest warrants were issued for his wife Pauline Johnson, also known as Pauline Kauffeld, and Lyndon Baker.
Court documents explain how one murder investigation led to another and show Charles Johnson had methamphetamine on him when he was arrested. That's the one thing police say seems to be connecting crimes.
"We're into a major investigation, into a major crime," TPD Sgt. Dave Walker said. "And it leads us all over the place."
Police still don't know who is responsible for November's quadruple murder at 1305 N. New Haven. But Sgt. Walker tells FOX23 the investigation is leading them to other crimes, like the kidnapping and murder of Shawn Whitworth.
"[He was] led up the hill, tied up again up there and killed," Sgt. Walker said. "He was slashed and we believe he was hit with a rock."
Police interviewed the three suspects about the quad murder before connecting them to Whitworth's after two of them were driving his missing car.
"They were alibied for the quad killing at that time, but the day we saw them and talked to them they were in [Whitworth's Buick] Rainier. We didn't know anything about the Rainier being a vital link to this other murder until about a week later."
This is the second case in recent months a meth-related homicide has led investigators to more meth crime.
"You talk about the Quinton Shaver murder where there's two woman willing to be kidnapped and a third one we find kidnapped that don't come forward with any of that information," Walker told FOX23. "It's eerily similar and unfortunately I don't think it's connected."
And even with Johnson and Kauffeld behind bars and officers searching for Baker, there is no suspect for the quad murder and the potential more crime will be uncovered.
"The longer we stay in an investigation, the chances of us digging and digging and digging [increase]," Walker said. "We have no choice but to arrest people who kidnap, torture and kill. We're just looking for the one that killed [at] 1305 N. New Haven."