A new true-crime TV series connects a serial killer to the 'Making a Murderer' case

A new true-crime documentary series claims that one man was responsible for several of the most high-profile murders of the past 70 years — including that of Teresa Halbach, whose killing was the focus of the Netflix series "Making a Murderer." 

"It Was Him: The Many Murders of Ed Edwards" debuts at 9 p.m. April 16 on Paramount Network, the cable TV channel formerly known as Spike.

Veteran detective John Cameron and Wayne Wolfe, Edwards' estranged grandson, set out to prove that Edwards was behind 60 years of murders, from the Black Dahlia case in 1947 and the deaths of JonBenet Ramsey and Laci Peterson, to the Zodiac killings in the late 1960s and '70s, and to Halbach, who was killed in Chilton in 2005. Steven Avery, who had been released from prison after being wrongly convicted of sexual assault, was found guilty of Halbach's murder.

The case gained new attention in late 2015, when "Making a Murderer," a documentary series re-examining the Halbach case, went viral on Netflix. 

According to the Paramount Network, Edwards was arrested in 2009 and found guilty of five other murders over a 20-year period. He died of natural causes in prison in 2011, four months before his scheduled execution. 

Before his final stint in prison, Edwards pleaded guilty in 2010 to the 1980 murders of high school sweethearts Tim Hack and Kelly Drew, both of Fort Atkinson. 

Over six episodes, the cable channel says, "It Was Him" chronicles Cameron's years-long effort "to piece together a colossal amount of evidence that could tie Edwards to some of the most publicized and violent murders of the last century."