Detectives Chloe Decker (Lauren Graham) and Dan Espinoza (Kevin Alejandro) divorced in Lucifer season 2, but their marriage had been falling apart even before Chloe met Lucifer Morningstar (Tom Ellis). Season 5 of the supernatural series about the Devil partnering with an LAPD homicide detective is set to premiere on Netflix in August 2020. By this point in the saga, Lucifer has returned to Hell and left behind a heartbroken Chloe, but the Devil's identical doppelganger, the Archangel Michael, arrives in LA to raise his own brand of hell.
Years before Lucifer season 1, Dan and Chloe met as detectives at the LAPD; they married and had a daughter named Trixie (Scarlett Estevez). However, Chloe and Dan were separated and living apart at the start of Lucifer because she felt Dan prioritized his career over his family. Chloe had custody of Trixie and the relationship between Chloe and Dan was frosty. But Dan immediately became jealous and suspicious when Lucifer entered the picture and somehow became an LAPD consultant and Chloe's partner. Lucifer and Dan had a mutual dislike and the Devil labeled Espinoza "Detective Douche", a nickname that stuck. In Lucifer season 1, Dan tried to win Chloe back; he began paying more attention to his family and even attended Taco Night at home. Dan and Chloe began to rekindle their romance, but Espinoza was hiding a dirty secret: his involvement with corrupt cop Malcolm Graham (Kevin Rankin), whom Dan shot. When Dan's complicity was exposed, it drove another wedge between him and Chloe.
Chloe kept Dan at a distance with low-key hostility while Espinoza simultaneously dealt with the fallout of his actions at the LAPD. In Lucifer, season 2, episode 3, "Sin-Eater", Dan and Chloe's marriage finally came to an end. Dan and Chloe had promised to take Trixie on a camping trip but neither would commit because of the state of their marriage. After Lucifer and Chloe solved the case of the Sin-Eater, Decker finally decided to forgive Dan but he surprised her by admitting that they're no good for each other, which also means they're no good for their daughter. Dan admitted it was time for him and Chloe to get a divorce and they formally ended their marriage.
In truth, Chloe had been denying her attraction to Lucifer up to that point. When she started to give in to his charms in Lucifer seasons 2 and 3, circumstances usually forced the Devil to not succumb to his own love for the Detective. But by Lucifer season 4, Chloe had finally learned the truth of who and what, exactly, Lucifer really was and it took her time to process how she felt about being in love with the literal Devil. Still, Lucifer season 4 ended with the Devil voluntarily returning to his seat in Hell, leaving behind his beloved Detective.
For his part, Dan fell in love with Charlotte Richards (Tricia Helfer), who was possessed by Lucifer's mother, the Goddess of All Creation, in Lucifer season 2. After the real Charlotte was murdered, Dan blamed Lucifer, and he even went rogue and formed a vigilante duo with Mazikeen (Lesley-Ann Brandt) as he raged about Charlotte's death. But as Lucifer season 5 dawns, Chloe's heart belongs to Lucifer, and vice-versa, which is the crooked trajectory the series as been headed for all along, so it's highly unlikely Dan and Chloe will ever rekindle their failed marriage.
Lucifer season 5 premieres on Netflix in August 2020.