Havonnah Johnson, News 9

OKLAHOMA CITY -- Investigators search for a break in a mysterious unsolved murder.

Skyla Whitaker and Taylor Placker were gunned down in 2008 on a Weleetka road.

Wednesday, News 9 told you about an Oklahoma man investigators questioned about the killings. News9 has learned more about him and his possible link to the case.

OSBI is still looking for the gun that was used to kill the Weleetka girls. Mike Taylor claims the man who murdered his daughter is connected to the 2008 killings. He says OSBI will have to prove him wrong by solving the case.

According to Taylor, Kevin Sweat was engaged to his daughter, Ashley, and admitted to slitting her throat. On July 11th, Ashley's remains were found in Weleetka. That same night Sweat allegedly made another confession.

"He offered more information about the Weleetka case. He told me he had already been questioned by OSBI and they had confiscated personal items of his," Taylor said.

OSBI wouldn't go into detail but told News 9, "Everyone in the region who committed a violent crime has been investigated for the Weleetka murders."

Taylor said he believes, with more digging, the investigation will lead back to Kevin Sweat.

"OSBI has those answers. My understanding is they knew that Kevin was dangerous and they were looking at Kevin at that time and had been looking at him," Taylor said.

Kevin Sweat remains in jail for admitting to murdering his fiancé.

The OSBI is offering a $5000 reward for a missing gun that may have been sold at a trade show this spring.

At this point OSBI said the gun used to kill the girls is most likely owned by someone not all connected to the murders.

OSBI is looking for a 40 caliber Glock 22 with serial number E-K-G-4-6-3-U-S.

If you have any information on the gun, call the OSBI.