'Making a Murderer' fans found a new piece of evidence that could change the whole case

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When the podcast "Serial" went viral, fans on Reddit and elsewhere set about looking for clues themselves.

The same is now happening for the Steven Avery case at the center of Netflix's "Making a Murderer" docuseries, and viewers have discovered a fascinating new piece of evidence.

Jerry Buting, one of the original lawyers defending Avery in the trial for the murder of Teresa Halbach, recently spoke with Rolling Stone, and said that Internet sleuths had found something he and his partner had missed.

Click through images from the trail:

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Steven Avery's trial from "Making a Murderer"
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'Making a Murderer' fans found a new piece of evidence that could change the whole case
Steven Avery looks around a courtroom in the Calumet County Courthouse before the verdict was read in his trial, March 18, 2007, in Chilton, Wis. Avery was found guilty of first-degree intentional homicide in the murder of photographer Teresa Halbach. Avery, who spent 18 years in prison for a rape he didn't commit only to be convicted of committing a murder 3½ years after he left prison, said Tuesday, April 17, 2007, he is confident he will again be exonerated. (AP Photo/Jeffrey Phelps, Pool, File)
This March 2007 file photo shows Calumet County District Attorney Kenneth Kratz giving his closing argument in the Steven Avery trial in the courtroom in Chilton, Wis. Police say Kratz sent repeated text messages trying to spark an affair with a domestic abuse victim while he was prosecuting her ex-boyfriend. (AP Photo/Morry Gash, File)
Karen Halbach, mother of Teresa Halbach, listens Tuesday, April 24, 2007, to testimony in the Brendan Dassey trial in Manitowoc, Wis. Dassey, 17, is charged with first-degree intentional homicide, mutilating a corpse and first-degree sexual assault in the death of 25-year-old Teresa Halbach on Oct. 31, 2005. His uncle, Steven Avery, 44, was convicted last month in Halbach's murder and is to be sentenced to mandatory life in prison in June. (AP Photo/Bruce Halmo, Pool)
Karen Halbach talks to the jury about her slain daughter, Teresa Halbach, during the trial of Brendan Dassey, Monday, April 16, 2007, at the Manitowoc County Courthouse in Manitowoc, Wis. Dassey, 17, is charged with first-degree intentional homicide, mutilating a corpse and first-degree sexual assault in the death of 25-year-old Teresa Halbach on Oct. 31, 2005. His uncle, Steven Avery, 44, was found guilty of her murder last month. (AP Photo/Dan Powers, Pool)
Tom Halbach, father of Teresa Halbach waits in the courtroom for the verdict in the Steven Avery Trial Calumet County Courthouse Sunday, March 18, 2007, in Chilton, Wis. Avery was found guilty of first degree intentional homicide in the murder of photographer Teresa Halbach, 25, on Oct. 31, 2005 near the family's auto salvage lot in rural Manitowoc County. (AP Photo/Patrick Ferron, Pool)
Sgt. Mark Wiegert with the Calumet Sheriff Department, testifies during Steven Avery's trial on Wednesday, March 7, 2007, at the Calumet County Courthouse in Chilton, Wis. Avery, 44, and his 17-year-old nephew are accused of murdering 25-year-old photographer Teresa Halbach and burning her body on Halloween 2005. The nephew, Brendan Dassey, is scheduled for trial in April. (AP Photo/Evan Siegle, Pool)
Steven Avery's attorney Dean Strang points to a photo showing a CD case that contained blood stains in Teresa Halbach's vehicle while questioning Nick Stahlke, a blood spatter expert with the Wisconsin Crime Laboratory during testimony in Avery's murder trial Tuesday, Feb. 27, 2007, in Chilton, Wis. Avery is accused of killing Teresa Halbach, 25, after she went to the family's rural salvage lot to photograph a minivan they had for sale. (AP Photo/Bruce Halmo, Pool)
Blaine Dassey, Steven Avery's nephew and the brother of Brendan Dassey testifies Tuesday, Feb. 27, 2007, during Avery's murder trial in Chilton, Wis. Avery is accused of killing Teresa Halbach, 25, after she went to the family's rural salvage lot to photograph a minivan they had for sale. (AP Photo/Bruce Halmo, Pool)
Manitowoc County Circuit Judge Patrick Willis listens to Steven Avery's attorney Dean Strang argue a point during Avery's murder trial Tuesday, Feb. 27, 2007, in Chilton, Wis. Avery is accused, along with his 17-year-old nephew, of killing Teresa Halbach, 25, after she went to the family's rural salvage lot to photograph a minivan they had for sale. (AP Photo/Bruce Halmo, Pool)
Marc LeBeau, unit chief of the FBI's chemistry unit, testifies in the Steven Avery homicide trial Monday, March 5, 2007, at the Calumet County Courthouse in Chilton, Wis. Avery is accused, along with his 17-year-old nephew, of killing Teresa Halbach, 25, after she went to the family's rural salvage lot to photograph a minivan they had for sale. (AP Photo/Mike De Sisti, Pool)
Steven Avery, left, exits the courtroom after closing arguments in his trial, Thursday, March 15, 2007 at the Calumet County Courthouse in Chilton, Wis. Avery is accused, along with his 17-year-old nephew, of killing Teresa Halbach, 25, after she went to the family's rural salvage lot to photograph a minivan they had for sale. (AP Photo/Dwight Nale, Pool)
Calumet County District Attorney Ken Kratz answers a question after the murder trial of Steven Avery Sunday, March 18, 2007, in Chilton, Wis. Avery was found guilty of first degree intentional homicide in the murder of photographer Teresa Halbach, 25, on Oct. 31, 2005 near the family's auto salvage lot in rural Manitowoc County. (AP Photo/Jeff Phelps, Pool)
The hands of Tom Halbach, father of Teresa Halbach, are shown as he waits for the verdict in the Steven Avery murder trial in the Calumet County Courthouse Sunday, March 18, 2007, in Chilton, Wis. Avery was found guilty of first degree intentional homicide in the murder of photographer Teresa Halbach, 25, on Oct. 31, 2005 near the family's auto salvage lot in rural Manitowoc County. (AP Photo/Patrick Ferron, Pool)
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"We were only two minds," Buting said. "What I'm discovering is that a million minds are better than two. Some of these people online have found things with a screen shot of a picture that we missed."

One of the crucial pieces of evidence dug up by those sleuths is a detail found in a common photo of Halbach before she went missing and died: It shows the victim with a keychain that has a number of keys on it.

View post on imgur.com

During the investigation of Halbach's murder, the police found a contested key to Halbach's car in Avery's home. But they only found the one key — not the rest of the keys seen on her keychain, which were never recovered.

Had this evidence been introduced in Avery's trial, it would've bolstered the argument that the sole car key, found weeks after an initial search of the Avery property, was planted. And if Avery does ever get another trial, it could help him still.

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