The "Child Killer" docuseries focuses on the unsolved murders of at least four children in Oakland County between 1976 and 1977.
Investigators have been working for decades to determine who the serial killer is and if he is still alive. Those who knew the victims -- their families, friends, classmates, teachers, coaches and neighbors -- have been forever changed by what happened during the 13-month period from February 1976 to March 1977. In that time, the four children were abducted and murdered with their bodies left in various locations within or just outside Oakland County.
There were at least two other murder cases that investigators believe may have been victims of the "Oakland County Child Killer" or "The Babysitter Killer," as some called him.
The ensuing murder investigation was the largest of its kind in U.S. history at the time.
Chapter 1: North Fox Island
One theory around the unsolved case revolves around North Fox Island, a remote island in Northern Michigan tied to a child pornography ring.
Frank Sheldon, originally from Southeast Michigan, owned the island. He was from a wealthy family, and by all accounts, was a nice and friendly guy.
In the late 1970s, Sheldon was charged with criminal sexual conduct in connection to what police said was a child porn ring, which was operating through North Fox Island.
It wasn't until years after that a connection to the unsolved Oakland County Child Killer case starting to emerge.
Chapter 2: Out in the Cold
The murders shocked communities around Southeast Michigan. Families started taking precautions, like prohibiting their children from leaving the house.
"Every mother walked her child to school. And at the end of the day, every mother would pick them up," said L. Brooks Patterson, who was the Oakland County prosector at the time. "Parents would not let their children out of their sight."
Chapter 3: Timmy King
The fourth victim to be connected to the case was 11-year-old Timothy King from Birmingham. He went missing on March 16, 1977. His body was found March 23, 1977 in a ditch along Gill Road, about 300 feet south of 8 Mile Road in Livonia.
After King's body was found, police knew they had a child killer on their hands. They organized the largest manhunt in U.S. history at that time. A task force was established.
Before the murder of Timmy King, police and the public couldn't fully connect the dots on the various cases of missing children and murders. All of that changed.
Chapter 4: The Investigation
After the murder of Timothy King in 1977, police assembled the largest task force in U.S. history at the time. It includes officers and detectives from police departments across the area.
Police knew they had a serial child killer on their hands.
Chapter 5: Suspicion
The largest task force in U.S. history at the time was assembled to try and find the child killer. Decades later, without a conviction, questions about the investigation have surfaced, including questions of mishandling evidence and clearing suspects prematurely.
Timothy King's father has sought the files related to the death of his son, but Oakland County Prosecutor Jessica Cooper has denied his requests.
King started his own investigation and in 2010, he said he was sure a man named Christopher Busch killed his son, despite Busch passing a polygraph test.
Other leads have connected the case to several suspects. Could one of them be the Oakland County Child Killer? Could investigators have done more?