- "If there's a killer out there, I'm gonna stop him, especially if he's a threat to someone I care about."
- —Billy Malone[src]
Detective William "Billy" Malone (died December 7, 2016) was a police detective of the Star City Police Department, a member of Mayor Oliver Queen's Anti-Crime Unit, and the boyfriend of Felicity Smoak. He investigated the case of the "Throwing Star Killer", before eventually getting abducted by Prometheus and set up as bait for Green Arrow.
When Ragman attacked a medical event sponsored by AmerTek Industries, Rene Ramirez was able to grab a piece of cloth from his suit, which he gave to Felicity in the hope that the Green Arrow could use this evidence to track down the rogue vigilante. Felicity, in turn, asked Billy to process the piece of cloth in the Star City Police Department's gas chromatograph, under the guise that the rag belonged to a friend's cleaning woman who had gone missing. Billy asked if she wanted to file a report for a missing person, but Felicity declined. Though Billy could tell she was not being entirely truthful due to how Felicity kept changing her story, he agreed to help her anyway and remarked that he had not yet met any of her friends before emphasizing that this was a hint that he would like to meet them. Felicity eventually revealed to Billy that she worked with the Green Arrow, but could not tell him the details of her vigilante life. Although excited about the Green Arrow, Billy warned Felicity of the dangers of vigilantism and started to investigate Team Arrow.
Billy eventually succeeded in finding out the identity of Mr. Terrific, which he revealed to Felicity, but not to Paul Holt. Despite Felicity's pleas, he investigated Prometheus's attack on Curtis Holt, discovering the connection between the Dycloseral drug in Curtis's blood and Claybourne Pharmaceuticals. Arriving at Claybourne Pharm abandoned manufacturing plant, he investigated the CEO's office, finding a picture of a baby. He made a photo of the picture with his phone, sending it to Felicity. As he turned to leave the premises, Prometheus ambushed Billy and abducted him. As the Green Arrow hunted down Prometheus to the site of his old confrontation with Justin Claybourne at an AK Desmond Group hideout, Billy was forced to wear a copy of Prometheus's suit, with a radio speaker from the real Prometheus adjusted to his armor. As Green Arrow pursued the villainous vigilante into a hall of mirrors, the real Prometheus escaped, leaving Billy behind as a target for Oliver. With everything going according to Prometheus's plan, Oliver shot and killed Billy as soon as he saw him, mistaking him for Prometheus, only to discover his error shortly after. The scene ends Prometheus saying Green Arrow that every person close to him dies.
Billy's death was avenged when Prometheus killed himself on May 17, 2017 upon the failure of his plans.
- High-level intellect/Expert detective: As a detective of the SCPD and a member of the ACU, Billy was a capable detective, being as successful as Team Arrow in finding info on Justin Claybourne's connection to Prometheus.
Behind the scenes
- In DC Comics the surname "Malone" is most well-known as the identity of a posthumous criminal that was stolen by Bruce Wayne/Batman and used for his own investigation missions in the criminal underworld. His first name is "Matches", and his primary role is that of a false identity for Batman to take on, allowing the Dark Knight with a useful 'in' to the criminal underworld without needing to establish an original identity with a fake reputation.