Lukas Hayes (ルーカス・ヘイズ Rūkasu Heizu?) is a character in the Tekken spin-off, Death by Degrees. He is a scientist who was employed by Kometa as Salacia's project manager. Lukas did not desire having Salacia used as a weapon of destruction, but to have it used as a viable alternative for current energy sources, such as fossil fuels.
He resents Doctor Boskonovitch for getting all of the attention, and blames him for being shut down. He takes Type J, a creation of Boskonovitch's that Boskonovitch left behind, to help with his plans of making the people that shut him down pay. Lukas also stores the computer that controls the Salacia satellite inside of it.
During the levels at the Solitaria Penitentiary, Nina Williams, the game's protagonist, must protect Lukas from enemies. Lukas is nearly killed at certain points during the game, such as when Anna Williams (Nina's sister and one of the antagonists of the game) kicks Lukas onto an old bridge, which he falls through. After Nina defeats Anna, it is revealed that Lukas got caught in some ropes beneath the bridge, saving his life.
Afterwards, Anna herself is knocked beneath the bridge by Type J, another antagonist of the game, and lands on him. They fall to the ground, landing on some sandbags, and Anna runs away, leaving Lukas to become Type J's new target (the original targets were Nina and Anna fighting on the old bridge). Nina must guide him through tunnels and away from Type J, which she successfully does. Lukas thanks her for saving his life afterwards.
Later, after Lukas manages to escape from Enrique Ortega, he meets Lana Lei and one of her henchmen. Lana's henchman shoots Lukas in the leg, and Edgar Grant apparently proceeds to slit Lukas's throat with a hatchet, as shown by the prints left upon said item. Lukas is then left hanging at the Solitaria Penitentiary. A defibrillator can be found in his locker in the "Pen. Experiment Pool" room of the Solitaria Penitentiary.
- Anna Williams - He is almost killed by her when she kicks him through an old bridge, but he gets caught in ropes below it, preventing him from falling.
- Type J - Attempts to kill him but he manages to evade it with Nina's help.
- Edgar Grant - Lukas is killed by him.