K8-23 was a runaway synth from the Institute in 2287.
Background
The courser X3-51 was sent after K8 by the Synth Retention Bureau. X3 discovered K8's bullet-riddled remains near Saugus Ironworks and returned their remains to the Robotics division. The SRB suspects the culprits to be members of the Forged.[1]
Notes
A runaway synth named K8 is the reason for the The Railroad quest Concierge.
Appearances
K8-23 is mentioned only in Fallout 4.