For anyone that thinks the phone call Colborn received about SA's innocence being irrelevant or otherwise not important, here is some excellent stuff from reddit:
It seems worthwhile to restate the facts surrounding the 2003 Wisconsin DOJ investigation into Avery's 1985 wrongful conviction, the 1995 phone call received by Sgt. Colborn, and Avery's civil lawsuit and depositions, since they're in the first 2 episodes of the documentary and many viewers forget the details with the onslaught of information about the subsequent Halbach murder, investigation and trials.
This is what is known via depositions, statements, and other documents:
1) The phone call which would have led to Avery's exoneration in 1995 was apparently not reported to the Wisconsin DOJ investigators in 2003. No written report/statement of it was included in the documents the Attorney General received from Manitowoc County (see Rohrer deposition and civil lawyers' remarks in doc.), and it was never mentioned in the DOJ's report on their investigation (with their stated goal of assessing "whether any criminal or ethical violations were committed by anyone involved in handling the [Avery] case"). (see link below)
In other words, the Wisconsin DOJ cleared the Manitowoc County Sheriff's Department of criminal wrongdoing in the 1985 wrongful conviction of Steven Avery, but it never cleared them of any criminal wrongdoing in the ignoring of exculpatory evidence that would have freed Avery in 1995, because they were never notified of the phone call from Brown County to Manitowoc County.
http://www.daysalive.com/share/DOJ_Review_2003.pdf
2) Avery's civil suit was filed before the phone call was discovered; the incident came to light during the gathering of documents - and depositions investigating that phone call had just started in late 2005 - 3 weeks before Halbach's murder.
Following the remaining depositions, notification of the DOJ, and any subsequent investigation, any/all of Colborn, Lenk, Petersen, Kusche, Rohrer, etc. could have been added as additional parties to the ongoing civil suit through the joinder process.
3) In the video-tape depositions (taken just 1-3 weeks before Hallbach's murder):
Oct.11: Lt. Lenk testifies under oath that he prepared his statement after meeting with then-Sheriff Petersen, and in it he states, "Sgt. Colborn said he was later informed that the case was already solved and the right person was arrested." His statement makes no mention of Gregory Allen, Steven Avery, Peggy Beertsen, ex-Sheriff Tom Kocourek, or whoever Colborn allegedly informed about the phone call or who told him that the case was solved.
-Oct.13: Sgt. Colborn testifies under oath that he doesn't recall telling anyone about the phone call except Lenk and Sheriff Petersen (and, again, his statement does not mention Allen, Avery, Beertsen, or any other names).
-Oct.13: Sheriff Petersen testifies under oath that he has never seen either Lenk's or Colborn's statements about the phone call before.
-Oct.26: Chief Deputy Kusche testifies under oath that Colborn told him that Colborn told ex-Sheriff Tom Kocourek that an officer from Brown County told him that Allen, and not Avery, might have actually committed the Beertsen assault.
So from the very start of the investigation into the incident, there were conflicting stories.
4) Just 5 days after Kusche's deposition contradicting Colborn and Lenk's - and 10 days before ex-Sheriff Kocourek was scheduled to be deposed - Halbach was murdered.