I would caution us all about assigning a diagnosis to BR. There are specific diagnostic criteria to be met to diagnose any mental condition, and in some cases additional consideration must be given to differentiate conditions that present with similar symptoms (differential diagnosis). A person may have comorbid conditions (coexisting, independent conditions) that complicate diagnosis. Beyond diagnostic criteria, there is the "feel" of the behavior and details that emerge in clinical vignettes, textbooks, and the broader literature. Not all people with the same condition present in the same way (some narcissists, for example, are gregarious and grandiose; others are quieter and humorless). There is not only behavior and behavioral history to consider but also why a person does what he does. Two different people can exhibit the same behavior for vastly different reasons.
On the board, most people mention Asperger's/autism spectrum disorder, conduct disorder, and antisocial personality disorder (ASPD) as possible diagnoses for BR. First, let me say we're all on the right track in wanting to give a name to what we see. There is clearly something abnormal about BR. But does he meet the criteria for any of these diagnoses? Could his behavior be due to some other condition(s)? I think so, but I'll get to that later.
Asperger's could account for much of what we see. However, BR lacks the repetitive motor behaviors that are virtually always part of the picture. Maybe we haven't seen a large enough behavior sample, but we don't know. However, Asperger's alone contributes nothing to our understanding of the murder, since violence is not part of the "Aspie" profile. If BR has Asperger's, he also has/had some other condition that compelled him to kill.
Conduct Disorder would apply to BR if at the time of the murder he met three of 15 criteria in the 12 months prior to the murder and at least one within 6 months AND if it can be demonstrated that he exhibited one characteristic prior to the age of 10 (i.e., he would have to qualify for early-onset CD). The behaviors listed in the criteria would have to represent a persistent pattern of behavior. I'm not going to list them all here but, at best, it's a stretch. He qualifies for CD if he mistreated the dog, and forced JBR into sexual behavior, in addition to smearing poop on her candy box. Or if he threatened or intimidated her, plus two of the other behaviors. But we don't know for sure. But let's say we did. We would still have to know whether this pattern of behavior impaired his social and academic performance. And from what we do know, BR had friends and did well in school. It seems he did and does have the lack of empathy and remorse characteristic of CD, but then these deficits alone do not prove CD and are characteristic of other disorders, as well.
Antisocial Personality Disorder? Read this very good overview of ASPD by David Porter, M.A., L.A.C.D. and see what you think:
APD (Antisocial Personality Disorder) is a DSM-5 (Diagnostic and Statistical Manual of Mental Disorders, fifth edition),
diagnosis assigned to individuals who habitually violate the rights of others without remorse (American Psychiatric
Association, 2013). People with Antisocial Personality Disorder may be habitual criminals, or engage in behavior which
would be grounds for criminal arrest and prosecution, or they may engage in behaviors which skirt the edges of the law,
or manipulate and hurt others in non-criminal ways which are widely regarded as unethical, immoral, irresponsible, or in
violation of social norms and expectations. The terms psychopathy or sociopathy are also used, in some contexts
synonymously, in others, sociopath is differentiated from a psychopath, in that a sociopathy is rooted in environmental
causes, while psychopathy is genetically based.
The term antisocial may be confusing to the lay public, as the more common definition outside of clinical usage is an
individual who is a loner or socially isolated. The literal meaning of the word antisocial can be more descriptive to both
the lay public and professionals: to be anti-social, is to be against society; against rules, norms, laws and acceptable
behavior. Individuals with Antisocial Personality Disorder tend to be charismatic, attractive, and very good at obtaining
sympathy from others, by describing themselves as the victim of injustice. Some studies suggest that the average
intelligence of antisocials is higher than the norm, though this has been disputed. Antisocials possess a superficial charm,
and have an intuitive ability to rapidly observe and analyze others, determine their needs and preferences, and present it
in a manner to facilitate manipulation and exploitation. They are able to harm and use other people in this manner, without
remorse, guilt, shame or regret, It is widely stated that antisocials are without empathy, however this can be disputed, as
sadistic antisocials will use empathy to experience their victim's suffering, and derive a fuller pleasure from it (Turvey, 1995).
ASPDs are deceptive, manipulative and exploitative as a way of life. It's not just what they do,
it's who they are.
Here are the diagnostic criteria:
A. Disregard for and violation of others rights since age 15, as indicated by one of the seven sub features:
1. Failure to obey laws and norms by engaging in behavior which results in criminal arrest, or would warrant criminal arrest
2. Lying, deception, and manipulation, for profit for self-amusement,
3. Impulsive behavior
4. Irritability and aggression; frequently assaults others or engages in fighting
5. Blatantly disregards safety of self and others,
6. A pattern of irresponsibility
7. Lack of remorse for actions
B. The person is at least age 18
C. Conduct disorder was present by history before age 15
D. The antisocial behavior does not occur in the context of schizophrenia or bipolar disorder (APA, 2013)
Unless a massive cover-up has taken place and BR was acting up a storm on Dr. Phil, a diagnosis of ASPD is away over the top. Where is the guile? the charisma? the intuitive ability to read others quickly for the purpose of exploiting them? He can barely speak in coherent sentences. Where is the evidence that he currently and repeatedly exhibits any of the seven behaviors in part A?
Kolar may be right in suggesting that BR had SBP (sexual behavior problems). It would explain what happened in 1996. However, it wouldn't explain what we are seeing now. Perhaps there was SBP and some other condition that persists.
BR may have a personality disorder other than ASPD. He could have what is called a schizoid personality. I hate to say it, but Wikipedia had a very good article on the subject, which includes this overall description:
Ralph Klein, Clinical Director of the Masterson Institute, delineates the following nine characteristics of the schizoid personality as described by Harry Guntrip: introversion, withdrawnness, narcissism, self-sufficiency, a sense of superiority, loss of affect, loneliness, depersonalization, and regression.[39]
This post is so long, I'll leave off here with the link to the Wikipedia article -
https://en.wikipedia.org/wiki/Schizoid_personality_disorder - and a caution again, even to myself, not to be overconfident in assessing and naming BR's abnormal psychology.