TULSA, Oklahoma - Tulsa police hope to make a third arrest in a murder they didn't even know happened until they got a tip that led them to the victim's body.

On Tuesday night someone called Crime Stoppers saying an 18-year-old boy named  Anthony Pietrzak had been beaten to death by Dearld Peal and Tracy Price.

When investigators started looking into the claims, they realized they were working Tulsa's 66th homicide of the year. 

"They called back and said, 'Wow this is looking like it may be credible.,'" said Tulsa Police Sergeant Dave Walker.

Police said Pietrzak, Peal and Price got into an argument on Sept. 22, and witnesses said there was a "brutal attack" against Pietrzak.

An arrest report states Peal's daughter told him Pietrzak had abused her.

Peal reportedly told police he was going to make sure Pietrzak would never be able to hurt his daughter again. 

The argument was never reported to police. 

"I don't know if they were just gonna teach him a lesson and it got way out of hand," Walker said. "Reports are that he was fighting for his life and he lost."

Walker said at least three men beat Pietrzak to death that night, then hog tied him and tossed his body out the back of a pickup truck into a field. 

Pietrzak's body was found Thursday morning. 

"Their intent was not to teach a lesson, it was to ultimately get away with murder and that failed," Walker said.

Police said the interview process was long and challenging.

Many people were questioned before they were given the tip that lead police to Pietrzak's body. 

Officers arrested Peal and  Price on complaints of kidnapping and first-degree murder. 

They are still looking for a third suspect. 

"If he wants to come in and give us a story we will gladly take it," Walker said.

If you have any information, call Crime Stoppers at 918-596-COPS (2677).