“We made our judgment, and the trial came to an end, and locally most people were in support of that,” Mr. Ring said. “Now it’s back — by no choosing or no doing of anyone in this community.”

“So that’s the first point of injustice,” he added. “That we have to live through it again.”

In downtown Manitowoc, the county seat, the talkative, curious people I had come upon a decade earlier were no longer surprised — or the least bit pleased — to see yet another reporter. Many avoided any talk about “Making a Murderer,” or simply spotted my notebook and walked away. The mayor declined to be interviewed. Business owners refused to discuss it: One said she had read online about a call for a protest in the town, and she was worried about safety.

“Look, we lived this whole thing like a juror,” Suszanne Fox, who lives not far from here, told me as she ate a burger at the Fat Seagull. “He was guilty as sin.”

Many viewers of “Making a Murderer” do not agree. Hundreds of thousands of people signed petitions asking President Obama to pardon Mr. Avery and Mr. Dassey, to which the White House has responded that the president cannot issue pardons in state cases. And Gov. Scott Walker has long pledged to issue no pardons while in office.

The series left viewers with unrelenting questions: Did Mr. Avery’s civil lawsuit for his wrongful sexual assault conviction motivate the Manitowoc County authorities to plant evidence against him in the second case, for murder? How was it that an old sample of Mr. Avery’s blood, which was found in the victim’s car, appeared to be tampered with while in the care of the authorities? Should Mr. Dassey, at his young age and with a limited intellect, have been questioned alone by investigators? Was his appointed lawyer working against his cause?