CHILTON, Wis. -- Steven Avery is expected to be charged with first-degree murder Tuesday, but a special prosecutor says it's possible others could be charged, too.

Steven Avery: An Interview From Jail

Calumet County District Attorney Ken Kratz told the Green Bay Press-Gazette that evidence pending at the state crime lab might implicate possible accomplices in the disappearance of 25-year-old Teresa Halbach.

Authorities said they found Halbach's partially burned remains and her SUV last week on the property of the Avery family salvage yard.

Halbach had been there Oct. 31 taking pictures for her job.

Police claim Avery's DNA was found in Halbach's car and on her car keys, which were found in his bedroom.

Police point to a gash on Avery's hand as an explanation of how they could have found Avery's DNA.

Avery told a Green Bay television station that he cut his hand on a piece of steel in the salvage yard.

Avery's father believes it's all a set up, but one brother isn't so sure.

"The way I feel is, he's guilty and he's not guilty and you know, I don't know," said Chuck Avery. "All we have to do is love him as a brother or whatever, even if he goes back to prison. You know, you've just got to take it day by day."

"All I can tell you is that it didn't happen on Avery property, if it happened" said Steven's father Alan Avery. "I don't believe it happened. It was a set up."

Avery, 43, claims he is innocent.

In a jailhouse interview over the weekend Avery said he is being set up, despite the scratches and burn marks on his arms.

"Planted evidence," said Avery. "How else could it be there? I didn't do nothing. It don't make no sense."

Avery maintains the set up was retribution for his lawsuit against Manitowoc County.

"The lawsuit they deserve," he said. "They can afford $36 million. They don't like the Avery's anyway."

Avery was exonerated of rape two years ago through DNA evidence after serving 18 years in prison.

A search warrant filed Monday indicated police have seized more than 35 items including graphic descriptions of human remains, a necklace and a computer hard drive.

Avery is expected to be charged Tuesday with intentional homicide and desecrating a corpse.