Reed is actually hunting the real killer, his former best friend Doug Hemmill , who accidentally caused Claire's overdose and framed Reed. The Washington D.C. Mission (High Stakes):
Néstor Carbonell (known for Lost ) portrays the episode's primary Person of Interest, Matthew Reed. Dual Main Plots
John Reese, Sameen Shaw, Harold Finch, Lionel Fusco, Root, Peter Collier, and Control.
The reunion guests believe Reed killed his girlfriend, Claire, on graduation night decades ago.