<P> Spencer Walter Reid was born in Las Vegas to William Reid (Taylor Nichols), a lawyer, and Diana Reid (Jane Lynch), a former professor of 15th century literature . Diana also has paranoid schizophrenia, and went off her medication during her pregnancy . Reid and his mother have a very close relationship despite her condition . </P> <P> At age four, Spencer was approached by a man, Gary Michaels, while playing chess at a local park . Although Spencer was unharmed, Diana insisted the family move because she believed her son was in danger . Shortly thereafter, Spencer's six - year - old neighbor, Riley Jenkins, was sexually abused and murdered . Diana told Lou Jenkins, Riley's father, about the park incident . Diana then followed Jenkins and witnessed him beat Michaels to death with a baseball bat, getting blood on her clothes in the process . In order to protect his wife, William burned Diana's clothes, which Spencer inadvertently witnessed . Jenkins avoided arrest because Michaels "disappeared", and as he had a criminal history as a sexual predator, the police didn't look very hard into the case . Years later, Reid starts having nightmares about the incident, initially leading him to believe his own father was Riley's killer . Rossi and Morgan help him investigate . After undergoing hypnosis to recover his memories, Reid mistakenly believes he saw his father burning Riley's clothes, not Diana's . He pursues his father as a suspect, even after it becomes clear that Michaels is the more likely perpetrator . Michaels' body is found, and DNA confirms his killer was Lou Jenkins, who is arrested . While Reid is interviewing Jenkins, demanding to know how his father was involved, his parents interrupt and confess to their son the whole story . </P> <P> At ten years old, Reid's father abandoned the family . The Michaels incident had already started the rift, and as Diana's mental state continued to deteriorate due to her paranoid schizophrenia, William left, refusing to take Spencer with him . He moved ten miles away, and never contacted his son . Reid finds out his father's address from Lou Jenkins seventeen years later, as well as the fact that his father never changed jobs . William later states that the reason he never returned was because he was too ashamed, and felt too much time had passed for him to re-enter Reid's life, although he did keep electronic tabs on his son . When his father was leaving, young Spencer tried to convince him to stay by using a statistic that children of parents who remain together receive more education . This angered William: "We're not statistics ." Reid states that one way he gets back at his father is to collect more educational degrees . </P> <P> Due to his young age and genius IQ, Reid was a victim of severe bullying in high school . In "Elephant's Memory", he recounts one instance where he was stripped naked and tied to a goalpost in front of other students, remaining there for hours . In "L.D.S.K.", Hotchner is forced to kick Reid in order to allow him access to a gun in order to shoot a suspect . When Hotch says he is sorry if he hurt him, Reid points out that he was a child prodigy in a Las Vegas school and tells Hotch, "you kick like a nine - year - old girl". Reid's social standing as a child increased when he started winning games as the coach of his high school's basketball team, using statistics to break down the opposing teams' shooting strategies . </P>

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