Carter Plimpton was a civilian worker at the software and electrical company Equinox as part of its quality control section, as well as a former member of the Phantom Eight watcher group.
In addition to that, Plimpton was also single and spent his free time collecting anime pillows.
At some point, he retired from the group and joined Equinox. However, when checking in an Equinox warehouse, he was ambushed by Bruce Johnson, who domestic terrorist Harper Dearing had hired and promptly interrogated by him via blowtorch burns.
Plimpton's body was later used as the ignition point in the warehouse, which also contained several Navy-related documents, to which the file he was personally attending to, a classified file regarding faulty Equinox wiring on board several Navy ships, was stolen, resulting in the involvement of the Baltimore Police Department as well as NCIS.