The Blacklist's Jolene/Lucy Brooks has managed to sneak into the Keen's lives, but her true identity may not remain a secret for much longer.

Will Jolene Tear Apart Tom & Liz Keen's Marriage On 'The Blacklist'?

An offender listed on the FBI's Violent Criminal Database, the mysterious Lucy Brooks (Rachel Brosnanhan) popped up in Tom Keen's (Ryan Eggold) life during "The Alchemist" as Jolene, the innocuous substitute teacher. While she proceeds to poke at cracks in the foundation of the Keen's marriage, TV Guide reports that Jolene will soon be revealed to have ties to a former Blacklister.

Which of the FBI's recent collars could Jolene be associated with? To find out, lets take a look back at Red's (James Spader) greatest hits.

Where Will James Spader's Red Turn For Answers About His Family On 'The Blacklist'? Will He Grow To Regret Killing A Prime Lead?

First up was Ranko Zamani (Jamie Jackson), Serbian terrorist, who tumbled off a roof in episode one. Next came The Freelancer (Daniel Sauli), a professional assassin who caused the death of another Blacklister, Floriana Campo (Isabella Rossellini).

Episode three then introduced viewers to Wujing (Chin Han) the Chinese spy, while episode four debuted a body disposal expert named the Stewmaker (Tom Noonan). Next came the Courier (Robert Knepper), who killed those who double crossed people; Gina Zanetakos (Margarita Levieva), who participated in corporate terrorism; Frederick Barnes (Robert Sean Leonard), a bioterrorist; Nathaniel Wolff (Justin Kirk), an anti-capitalist terrorist; Anslo Garrick (Ritchie Coster), a mercenary and former partner of Red; the Good Samaritan (Frank Whaley), a serial killer; The Alchemist (Ryan O'Nan), a genetics expert; and Owen Mallory (Campbell Scott), the creator of a baby farm.

Considering Red obtained her Violent Criminal Database ID number from Wujing, there is a slim chance that Lucy Brooks/Jolene is connected to a very early criminal. However, Red's knowledge of Brooks could easily predate the introduction of her Blacklist connection.

The Blacklist airs Mondays at 10 p.m. ET on NBC. Click the video below to see a preview for the series' most recent episode, "The Cyprus Agency."