I am quoting myself from info I posted on DAH thread.
DHeinrich will add a new dimension to this study , I feel , because it appears he escalated and then stopped.
Here is the info:
This is right from St. John's. But remember these studies are from criminals who were caught. And if 40% fit, then 60% do not. etc
http://faculty.csbsju.edu/uspp/CrimPsych/CPSG-6.htm
Nonfamily Child Abductors Who Murder Their Victims
• Nonfamily child abductions have a low rate of occurrence
• However, they are highly publicized and tend to overwhelm most communities’ local police force.
• This is a study of nonfamily child abductors who murdered. The information was gathered from interviews with incarcerated offenders, and reviews of criminal, medical, and psychological records.
Previous Research
• Vast majority (97%) male
• Mostly white
• Usually young adult (mean age 27)
• Female killers in this category are nearly nonexistent
Method
• Interview process
• Three main criteria
1 victim was less than 18 years old
2 offender was convicted of murder
3 victim was abducted by the offender
• 25 child abductors who murdered participated
Results
• Gender: All offenders were male; females did abduct, but none killed
• Age: Mean was 27, range was 14–58, 72% were younger than 30
• Race: majority white, interpret with caution
• Marital history: 60% were not married at time of offense, 24% were divorced, 8% were in common law marriages, 8% were married
• Children: 56% had no children at time of offense, 16% only had one child, 20% had two children, no one had three children, and 8% had four or more children
• Education: Little formal education; only 8% had some college education
• Occupation: Most had lower-level unskilled jobs, only 8% had skilled positions
• Military: 76% did not have military history
• Religion: 88% grew up in a Christian household and 72% still considered themselves Christian
• Animal abuse: 20% had history of animal abuse
• Psychiatric: 36% had a psychiatric diagnosis prior to offense, perhaps an underestimate
• Family background: 56% lived with both biological parents during childhood, 40% had mothers that were unemployed, 16% reported having occasional instability and disruption in their household
• Family incarceration: 24% reported at least one parent had been incarcerated
• Offender incarceration history: 40% had previous incarceration, almost half had a juvenile offense history
• Childhood behavior patterns: Chronic problems from birth to age 12, including enuresis, isolation, lying, arson, and alcohol and drug abuse
• Adolescent behavior patterns: Increase in drug and alcohol abuse, isolation was significant problem, and decrease in enuresis and arson
• Adult behavior patterns: No one reported enuresis; lower levels of arson and lying; drug and alcohol abuse were elevated
• Sexual behavior history: 28% were sexually molested, 20% had printed *advertiser censored* collection, no one had video *advertiser censored* collection, 88% were heterosexual, 20% identified themselves as pedophiles
• Psychopathy: Only 4 of 20 offenders classified as psychopaths
Discussion
• Findings are consistent with previous literature
• Interviews allow for a more in-depth view of offenders
• No glaring warning signs that could predict an offense
• Many offenders are not socially integrated within society
• Majority of offenders did not meet criteria for classification as a psychopath
• Self-reported data and small sample size may complicate results
Reference
Beyer, K. R., & Beasley, J. O. (2003). Nonfamily child abductors who murder their victims: Offender demographics from interviews with incarcerated offenders. In J. H. Campbell & D. DeNevi (Eds.), Profilers: Leading investigators take you inside the criminal mind. (pp. 313–333) Amherst, NY: Prometheus Books.