Death Lockett (Rebecca Riker) may be a fictitious character appearing in American comic books published by Marvel Comics.
Marvel Now! Death Locket first appeared within the # 1 issue of the Avengers Arena series as part of! Event, and was created by Dennis Hopeless and Kev Walker.
Death Lockett appears together of the most characters within the Avengers Undercover starting in 2014. 
A fictional character biography
One of the sixteen teenagers kidnapped by a female teenage version of Deathlock, he’s forced to fight one another to the death in his latest Murderwold version.  because the games begin in Murderworld, he confronts Hazmat then quickly fights with Gummi. Kammi gives her the nickname Death Locket. Throughout the primary day, Death Lockett remembers past events leading up to his appearance. Rebecca Ryker is that the daughter of Harlan Ryker. After being injured in an explosion that killed her mother and brother, Rebecca was rebuilt using the Deathlock technology her father developed. He joins the Braddock Academy team (which includes Apex, Kid Britain, Anachronism, Bloodstone and Nara).  Justin is attacked by an unidentified cybernetic creature, and Sentinel crushes him as he’s employed on the flaps around him. 
An earthquake separates Bloodstone and Anachronism from Apex, Nara, Kid Britain and Death Locket. Wounded Reptil gets up and destroys Chase’s reputation, saying that the one who attacked him was Death Lockett. Meanwhile, Rebecca is inactive as she takes charge of her Death Locket cybernetics, and she or he blasts Nara from a cliff and into the ocean . Kit Britain gets so angry that he tries to kill her until Apex orders him to not .  Nara, Anachronism and Bloodstone disintegrate and survive, and conclude that Apex treats Death Locket and Kit Britain to its own ends. Nara and Apex then start arguing, and Apex confirms that he was the one who ordered the Death Locket to attack Nara.  Justin Seyfert has reportedly escaped from a cybernetic creature, but is now paralyzed below the hip thanks to injuries sustained during the sentinel crash. Disturbed at the expense of his ally , Juston saves the remains of the Sentinel and builds a battle shield that he uses to attack the Death Locket.  Apex uses the Death Locket to assist kill Nico.  After a crew resurrects Nico, he breaks the cybernetic arm of Death Locket and traps her and Apex underground. Death Lockett explores the comfort of ending her and Apex.  Apex’s brother, Tim, fixes the hand of Death Lockett, gives her a replacement cannon, and unleashes the first Darkhawk Chris Powell to attack the arcade.  The arcade quickly escapes and talks to Apex to finish the sport . He regains control of the Death Locket and uses Chris to explode.  Apex unleashes bugs, emotional hurricanes, and armed sands to attack the remaining teens in Colliworld.  Tim soon breaks freed from the Death Locket, and she or he is angry enough to attack Apex. Apex quickly turns to Tim and tells him to shoot the Death Locket, thus stopping the sport . She is shocked initially , but soon complies, and everybody can shake Murderworld. 
The Avengers Undercover
When news of arcade trafficking came to light, Death Lockett and other murder world survivors were notorious. Death Locket S.H.I.E.L.D. Agents shouted about his actions within the arena, which are some things he doesn’t appreciate.  However, when anachronism reveals that Bloodstone has disappeared, all the survivors attend Bagalia to seek out him. On their way, Death Lockett reveals that she doesn’t really skills to fight, but Hazmat encourages her to use her gun, then congratulates her on how well it worked. Once they find Bloodstone, he reveals that he enjoys life among the villains, while the others, minus the gummy, begin to admire it. The deck locket is additionally attacked by the Excavator of the Wrecking Crew. When Kammy tries to inform the others to go away , Timon Hellstrom teleports to the arcade’s latest banquet instead in order that they can kill him.  While at the party, Dellen takes Lockett Cullen and Nico to dismantle the arcade’s computers and halt his powers in order that the team can fight him. They win and hit the arcade before Hazmat kills him with a huge radiation bomb.  After escaping the mansion, the group is captured by S.H.I.E.L.D, but soon “rescued” by Dyman Hellstorm. Satan’s son Baron brings the group to the front of Zemo, who gives the group the chance to hitch his forces.  While taking a tour of Bagalia provided by Constructor, Becca and Chase find bond with young masters. Again, Becca finds herself tied to the excavation. the remainder of the group meets while hanging out with Becca Young Masters. Every member of the group, apart from Kammi, is that the offer of Baron Gemo