Operating in Texas during a concentrated period in the mid-1980s, Green carried out a series of killings that involved his wife as a direct participant in at least two of the cases — a detail that set his crimes apart from the profile of the solitary offender. The collaboration between partners in homicide is relatively rare and complicates the standard narratives of culpability and coercion that courts must weigh. He was ultimately held accountable for all four known murders before his execution in 1997.

The gap between notoriety and harm is wide enough here that this entry doesn't belong on Evil Birthdays. Zhou Liqi is a social media personality whose fame traces back to a minor theft arrest — nothing in the available record suggests a pattern of serious harm, historical significance, or the kind of documented wrongdoing this site covers. Including him would dilute the weight the site relies on.

Her victims were elderly women living alone — a population that investigators initially struggled to connect, and whose vulnerability made the crimes difficult to detect across Mexico City's sprawling jurisdiction. The investigation was further complicated when authorities arrested and misidentified other suspects, allowing the killings to continue. Barraza's conviction covered 16 murders, but official estimates placed the total attributed to her between 42 and 48, with more than 30 cases left unresolved when the investigation was formally closed following her arrest.

Robinson operated for decades as a con artist and forger before his crimes escalated to kidnapping, rape, and murder, making him one of the first documented cases of a serial killer who used the internet to locate victims. His ability to sustain a respectable public image — as a businessman and community figure — while simultaneously committing serious crimes across multiple states reflects the calculated, long-term nature of his offending. The full scope of his crimes extended beyond the three Kansas murders for which he was sentenced to death in 2003.

From Wikipedia: "John Edward Robinson (born December 27, 1943) is an American convicted serial killer, kidnapper, rapist, and forger. He was found guilty and received the death penalty in 2003 for three murders committed in Kansas." Content sourced from en.wikipedia.org/wiki/John Edward Robinson under CC BY-SA 4.0.

His victims were travelers — people who accepted a ride and expected to reach their destination. Over roughly three years in the early 1990s, Milat used the isolation of Belanglo State Forest to carry out a series of killings that left seven dead and cast a long shadow over backpacker culture in Australia. The case drew sustained international attention, in part because his victims came from multiple countries and in part because the crimes remained undiscovered for years after they occurred.