Antonis Daglis was born in 1974 in Nikaia, a suburb of Athens, Greece. He had a troubled childhood, witnessing his mother engage in prostitution, which deeply affected his psyche. At the age of 14, he began exhibiting delinquent behavior, leading to multiple arrests for offenses such as seducing a minor in 1988 and attacking a group of men with a knife in 1989. He later worked as a truck driver, a job that facilitated his criminal activities.

Between 1992 and 1995, Daglis targeted female prostitutes in Athens. He would lure them into his white Volkswagen van, where he strangled them, sometimes during or after intercourse. In at least two cases, he dismembered the bodies using a chainsaw and disposed of the remains in various locations around the city. His known victims include:

Unnamed Woman (1992): His first known victim, a prostitute whose dismembered body was found in a dumpster. Eleni Panagiotopoulou (29): In October 1995, her mutilated body was discovered along the Athens-Lamia highway. Athina Lazarou (26): In December 1995, her body was found in the Votanikos area of Athens.

Daglis also attempted to murder six other women, including British tourist Ann Hamson, who managed to escape and later identified him to the authorities. He was arrested on January 21, 1996, after a series of investigations and victim testimonies. ​

During his trial, Daglis expressed deep-seated hatred towards prostitutes, attributing his actions to traumatic experiences from his childhood, particularly his mother's involvement in prostitution. He claimed to have heard voices compelling him to kill. On January 23, 1997, he was convicted of three murders, six attempted murders, ten robberies, and other offenses, receiving thirteen life sentences plus 25 years.

On August 2, 1997, Daglis was found hanged in his cell at Korydallos Prison, alongside his cellmate Giorgos Makridis, in an apparent suicide pact.