The phrase "key suspect" refers to a person who is believed to be very important in a criminal investigation or a crime. They are considered a central figure or a primary person of interest in the case. Full definition
2009 October - The government says it will co-operate with the International Criminal Court (ICC) to try key suspects in post-election violence. (bbc.co.uk)
Dodging bullets, a kidnapping, trumped - up charges and the FBI's unwanted intervention, Rick and Laura continue tracking key suspects who have motive... eventually learning that true redemption begins at home. (kindlenationdaily.com)
US Army Officials have repeatedly argued that torture does not work, and did not work in identifying or locating key suspects. (ccla.org)