Note: I apologize for the mistakes in the article, English is my second language
Welcome back NationTV. The character of Marcus Pierce was introduced to us in the third season of Lucifer. He serves as the Main Villain for the show in Season 3. Marcus appears as a new boss for Chloe Decker, Lieutenant LAPD. Later we know that he is, in fact, Cain from the Bible, the world's first killer. He was cursed with eternity and thus he survived. It is also a criminal mastermind popularly known as Sinnerman.
He was the son of Eve and Adam. He had a lot of battles with his brother Abel, it got so bad that they tried to kill each other until Cain managed to kill him. After doing this, God cursed him with eternity and marked him. His punishment was to walk the earth alone forever.
Amanadiel was the angel who gave Cain his imprint on God's orders. Since then, Cain tried to kill himself, but he could not because of the curse. He tried all sorts of ways like jumping from the helicopter, acid showering, and even jumping into the volcano. At the beginning of the third season, we see him transferred from Chicago to Los Angeles and there he joins the LAPD.