ORLANDO, FL - JULY 17: Casey Anthony (L) and her defense attorney Jose Baez leave the Booking and Release Center at the Orange County Jail after she was acquitted of murdering her daughter Caylee Anthony on July 16, 2011 in Orlando, Florida. It was unknown where Casey Anthony was going after the release. (Photo by Mark Wilson/Getty Images)

Investigation Discovery may have just broken out.

True crime cable channel ID broke its own TV ratings records with three-part limited series “Casey Anthony: An American Murder Mystery.” Not only was the Sunday, April 9 premiere the most-watched show debut in ID’s history with more than 4 million total viewers, it also ranked No. 1 across all of television at 10 p.m. among adults 18-49 and those 25-54.

Including three days of delayed viewing, the Casey Anthony (pictured above with defense attorney Jose Baez) case study ended up claiming 3.603 million total viewers on average across three straight nights. On a per-episode basis, that makes it ID’s best-ever performer among the advertiser-coveted demographics mentioned above.

Also Read: Nancy Grace Is Disturbed by 'Casey Anthony's Desire to Inject Herself Into the Spotlight Again'

Interviewees featured in the series include Caylee’s grandparents, Judge Belvin Perry, Jr, alternate juror Russ Huekler, George and Cindy Anthony’s attorney Brad Conway, as well as crime reporters and TV journalists Jane Velez Mitchell, Diane Dimond and Beth Karas.

The limited series also featured new evidence and never-before-seen footage of Casey Anthony.

“Casey Anthony: An American Murder Mystery” hails from Weinstein Television, American Media, Inc., and Jupiter Entertainment. Harvey Weinstein, Bob Weinstein, Patrick Reardon, Stephen Land, Allison Wallach, Matt Sprouse, David Pecker and Dylan Howard are executive producers. ID’s Pamela Deutsch is senior executive producer.

'Making a Murderer': Where Are They Now? (Photos)

Ken Kratz: The Avery case prosecutor says he has overcome an addiction to prescription pain pills since the trial and gone through the public humiliation of a sexting scandal. He maintains his license and now serves as a defense attorney.
Netflix
Mike Halbach: The brother of murder victim Teresa Halbach has served as a Halbach family spokesperson is now the director of Football Technology for the Green Bay Packers.
Green Bay Packers
Sgt. Andrew Colburn is now Lt. Andrew Colburn. He holds the title in the Detective Division of the Manitowoc County Sheriff's Office.
Netflix
Gregory Allen: Allen, who was found to have committed the rape for which Steven Avery spent 18 years behind bars, is serving a 60-year prison sentence for a 1995 sexual assault. He's up for parole in October 2016.
Netflix
Sheriff Tom Kocourek: Kocourek retired from his post in 2001. He was named as a defendant in a $36 million federal lawsuit brought forward by Avery.
Netflix
Angenette Levy: Levy, a journalist who garnered a lot of "Making A Murderer" playback attention for asking the tough questions, is now an on-air reporter for WKRC in Cincinnati.
Netflix
Aaron Keller: Levy, another reporter, is now an English/Communications professor at NHTI, Concord’s Community College in New Hampshire.
Netflix
Dean Strang: Strang recently said that he occasionally speaks with Avery, his former client. The defense attorney is not shying away from the spotlight, and recently took part in a Facebook Q&A. The trial lawyer is a partner at Strang Bradley LLC in Madison.
Strang Bradley LLC
Denis Vogel: The ex-DA is now an attorney at Wheeler, Van Sickle and Anderson, S.C., where he concentrates on commercial litigation, with a focus on matters involving utilities, electricity use and distribution, and cellular telecommunications.
Wheeler Law
Steven Avery: Well, he's in jail -- the Waupun Correctional Institute, to be exact.
The Innocence Project
Brendan Dassey: On August 12, 2016, a federal judge overturned his 2007 conviction for first-degree intentional homicide, second-degree sexual assault, and mutilation of a corpse. Avery's nephew had been sentenced to Avery's nephew sentenced to life with no parole for 41 years for Halbach's murder.
Netflix
Sheriff Ken Peterson: Peterson retired as Manitowoc County sheriff in 2007, just two years after he now-famously told a TV station it would have been "a whole lot easier to eliminate [Avery] than it would to frame him."
Netflix
Barb Tadych: Brendan's mom has publicly kept a low profile since all the "Making a Murderer" hype began. Tadych appears to remain in the area, as her most recent social media check-in was at a Center for Diagnostic Imaging in Appleton, Wis.
Netflix
Sandy Greenman: It appears that Avery and Greenman are still an item. Per what appears to be her Facebook page, Greenman visited Avery in prison as recently as Monday.
Bustle
James Lenk: Lenk has managed to keep one of the lowest profiles of the entire "Making A Murderer" gang. It is unclear whether has a Netflix subscription.
Netflix
Jodi Stachowski: Steven's ex-fiancee has had some legal troubles. In April 2007, she was found guilty of using worthless checks. She was arrested three times in 2009. Since then, Stachowski has stayed out of major criminal trouble.
Bustle