Serial killers don't always act alone either. Three basic types exist: individual, team (two or more), and organizational, which can include gangs, criminal enterprises, and even terrorist groups.
In October 1984 Bundy, who now considered himself an expert on the mind of the serial killer, contacted Robert Keppel and offered to share his self-proclaimed expertise in the ongoing hunt for his successor in Washington, the Green River Killer. Keppel and Green River Task Force detective Dave Reichert interviewed Bundy, and a book was later written, but Gary Leon Ridgway was captured 17 years later without Bundy's help.
CHAPTER 4 - The Dawn of the Less-Dead: Serial Killers and Modernity
This is a really neat site about the profiling of serial killers and other mass murders. A lot of it is based on information from the FBI, and it has some cool information about the killers, and how detectives can often determine a profile of a potential suspect just by looking at the crime. It is pretty coo, and worth a look, especially if you read Mind Hunter, and found it interesting
Psychological Disorders of Serial Killers | Flow Psychology
During a trip to California on Republican Party business in the summer of 1973, Bundy came back into the life of ex-girlfriend Stephanie Brooks, who marveled at his transformation into a serious, dedicated professional, influential in political circles, and about to enter law school. Bundy continued to date Kloepfer as well; neither woman was aware of the other's existence. In the fall of 1973 he enrolled at UPS Law School and continued courting Brooks, who flew to Seattle several times to stay with him. They discussed marriage; at one point he introduced her to Davis as his fiancée. In January 1974, however, he abruptly became cold and distant, ceased calling her, and refused to return her phone calls or letters. Finally reaching him by phone a month later, Brooks demanded to know why he had unilaterally ended their relationship without explanation. In a flat, calm voice, he replied, "Stephanie, I have no idea what you mean..." and hung up. She never heard from him again. Later, he explained, "I just wanted to prove to myself that I could have married her." In early 1974 Bundy began skipping classes at law school, and by April had stopped attending entirely. At about the same time, young women began to disappear in the Pacific Northwest.
Sons of Cain: A History of Serial Killers
There is no definitive agreement on when and where Bundy began killing women. Bundy told different stories to different people and refused to divulge the specifics of his earliest crimes, even as he confessed in gruesome detail to dozens of later murders in the days leading up to his execution. He told attorney Polly Nelson that he attempted his first kidnapping in 1969, but did not kill anyone until 1972. Earlier, he told a psychiatrist that he killed two women in Atlantic City in 1969 while visiting family in Philadelphia. In his penultimate interview with King County Detective Robert Keppel, he mentioned a homicide in 1972 and another in 1973 involving a hitchhiker near Tumwater, Washington, but refused to elaborate. Rule and Keppel both believe he may have started killing as a teenager. There is some evidence that he killed a young girl in Tacoma in 1961 when he was only 14 years old, although he denied it. His earliest documented homicides were committed in 1974, when he was 27. By then he had (by his own admission) mastered the skills needed—in the era before DNA profiling—to leave a minimum of incriminating evidence at a crime scene.
The Psychology and Psychodynamics of Serial Killers
For example, "a rapist who enters an apartment through an open window, telling the victim that they should lock their windows as it simply isn't safe to leave them open." by Savannah Babcock The Psychology of Serial Killers Serial killers are categorized into four types of murderers: Visionary Motive, Missionary-Oriented, Thrill-Oriented, and Lust Killers.