[s4e7] Memoriam -

The episode moves away from a traditional "unsub of the week" format to explore a deeply personal mystery:

: Reid suspects his estranged father, William Reid, may have been involved in the murder. This leads to a tense reunion between the two, as Spencer confronts the man who abandoned him and his mother years earlier. [S4E7] Memoriam

: It is eventually revealed that Reid's father, William, did not kill Riley Jenkins. Instead, he confessed to killing Gary Michaels, a pedophile who had targeted Spencer after already murdering Riley. The episode moves away from a traditional "unsub