Driven by his nightmares, Reid stays behind in Las Vegas to find his father in order to find out the truth about Riley Jenkins' murder.



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Episode cast overview, first billed only:
Det. Hyde
Lou Jenkins
Dr. Jan Mohikian


Based on his nightmares, Reid decides to stay in Las Vegas to probe deeper into his nightmare, specifically if his father, William Reid, who abandoned him and his mother when he was a child, was the murderer of six-year old Riley Jenkins when Reid himself was only four. Rossi and Morgan decide to stay and assist Reid. Reid learns that his father has been living just outside of Las Vegas all these years. Upon meeting his father, Reid confronts him with his suspicions. Reid Sr. denies any involvement or knowledge of the murder. Immediately after Reid confronts his father, an anonymous source provides another suspect for the murder. After going into hypnotherapy, Reid also thinks that his mother, Diana, is suppressing some memories from an incident surrounding the murder. Diana decides to go off her medication so that she can remember what happened the night that caused her mental instability. Meanwhile, J.J. goes into labor, three weeks before her due date. Written by Huggo

Plot Summary | Plot Synopsis


TV-14 | See all certifications »




Release Date:

12 November 2008 (USA)  »

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Aspect Ratio:

1.78 : 1
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Did You Know?


The title of Reid's thesis is: "Identifying Non-obvious relationship factors using cluster weighted modeling and geographic regression", published by "Department of Engineering, California Institute of Technology" See more »


Throughout this episode, it is constantly mentioned that the victim was found dead in the basement of the house. Since this episode takes place in Las Vegas, Nevada, it bears mentioning that homes in Las Vegas, even older homes do not have basements. See more »


David Rossi: [referring to Reid's father] He's keeping tabs on you. That's saying something.
Dr. Spencer Reid: Yeah and he Googled me. That makes up for everything.
See more »


Featured in Criminal Minds: Spencer (2017) See more »


Theme from Criminal Minds
Written by Marc Fantini and Steffan Fantini
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User Reviews

Even better than "The Instincts"
19 November 2016 | by (United Kingdom) – See all my reviews

"Memoriam" and "The Instincts" were returns to form after (from memory) being disappointed in "Catching Out", and among the best episodes of Season 4. When 'Criminal Minds' have focused mostly or entirely on one character, results have varied.

Some have been great (like a lot of the Reid-centric episodes, like this, "The Instincts", "Entropy", "Revelations" and "Elephant's Memory", "100" for Hotch and "Zoe's Reprise" for Rossi). Others have been underwhelming ("200" for JJ, "The Black Queen" and "Burn" for Garcia and "Derek" for Morgan).

The story was an incredibly powerful, intense and moving one, dealing with the dark sides of Reid's past and the present-day Reid goes through some very complex emotions here. The dreams are still as eerie as they were in "The Instincts" and perhaps even more so. The script was thought-provoking, intelligently written and taut, especially with Reid and Diana, profiling may be little but this is a case where it didn't necessarily matter. Also loved the sweet and touching part at the end when JJ gives birth and names Reid as godfather, a welcome uplifting side to a dark case, and Rossi and Morgan's concern and compassion.

Matthew Gray Gubler's acting is truly superb in "Memoriam". This is also the case with Jane Lynch, harrowing and affecting in a serious role. In fact, everybody is great and the chemistry between the team still delighting.

Production values are impeccably done as always, and there is nothing to fault the music or directing.

Overall, a high point of Season 4 and along with "The Instincts" saw the season (a vast majority of which has been a strong one, one of the show's better seasons) and the show in general returning to form. 10/10 Bethany Cox

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