András Pándy was born on June 1, 1927, in Chop, a village in Carpathian Ruthenia, which was part of Czechoslovakia at that time. His parents were Hungarian. As a young man, Pándy became a church councillor for the Reformed Church in Hungary. He later met his first wife, Ilona Sőrés.

In 1956, after the Hungarian Revolution failed, Pándy and his family fled to Belgium. In Brussels, Pándy became a pastor for a small Hungarian Protestant community and worked as a religious teacher for the United Protestant Church. The couple had their first child, a daughter named Ágnes, in 1957, followed by two sons, Dániel in 1961 and Zoltán in 1966.

However, shortly after Zoltán's birth, Pándy and Ilona separated. Pándy accused Ilona of being unfaithful. After the separation, Ilona moved out with their two sons but left Ágnes, who was 11 years old at the time, with Pándy.

In the early 1970s, after his marriage ended, Pándy began to date other women using Hungarian newspapers. He often provided false details about himself and called this endeavor "European Honeymoon." During this time, he visited Hungary regularly, where he would meet and eventually marry his second wife, Edit Fintor.

Edit was a married woman with three daughters: Tünde, Tímea, and Andrea. After Pándy and Edit fell in love, they eloped to Belgium along with her children. They married in 1979 after Pándy's divorce from Ilona was finalized. Soon after marriage, they had two more children, a son named András Jr. and a daughter named Reka.

Shortly before Tímea ran away to Vancouver, she confided in her mother that András Pándy was the father of her son and had been abusing her. This led to a heated argument between Tímea’s mother, Edit Fintor, and Pándy. Shortly after this argument, Tímea and her younger sister, Andrea, disappeared. Pándy told the police that they left him for another man and had moved to Germany, providing a forged telegram as proof.

In 1988, another pair of disappearances occurred when Pándy's ex-wife, Ilona, and his two sons, Dániel and Zoltán, vanished as well. Initially, Pándy claimed they had relocated to France but later changed his story to say they went to South America. In 1990, Tünde, Fintor's daughter, was still living with Pándy. He sent Ágnes, his daughter, on vacation with his younger children, András Jr. and Reka. When Ágnes returned, she discovered that Tünde had also disappeared. Pándy told her that Tünde had become "disturbed" and was sent to live with another family.

The police investigation into these disappearances began slowly and with little urgency. Pándy managed to evade suspicion by using fake testimonies and false evidence. In 1992, Ágnes attempted to report Pándy for sexual abuse, which slowly led to increased scrutiny from the police. Hungarian authorities became interested in Pándy due to connections to a growing number of missing women in Hungary. Pándy visited Hungary often and had a summer home there. During these visits, he would charm local women and entice them to come back with him to Brussels.

Eventually, two women, Eva Kincs and Margit Magyar, claimed Pándy had lured them to Brussels with the promise of marriage. They ended up trapped in his home, forced to cook and clean for him. After they rejected his marriage proposals, Pándy let them go back to Hungary.

On October 16, 1997, Pándy was arrested. That day, a significant demonstration took place in Belgium for the victims of another serial killer, Marc Dutroux. This timing brought attention to Pándy's case, leading to considerable media coverage.

In November 1997, Ágnes was arrested and confessed to her role in many of the murders of her family members. She claimed responsibility for her mother Ilona's murder and admitted to participating in the killings of Dániel, Zoltán, Edit, and Andrea. Pándy allegedly killed Tünde without her assistance. Ágnes described that some murders involved a handgun, while others were committed with a sledgehammer. The bodies were dismembered and disposed of in various ways, including being dissolved in a chemical solution.

A trial followed where Pándy denied the charges. He dismissed the proceedings as a "witch trial." His bizarre claims included that his deceased family members were still alive and communicating with him through angels. Eventually, enough evidence was collected to convict him of six counts of murder, attempted murder, and three counts of rape.

On March 6, 2002, Pándy was sentenced to life imprisonment without the possibility of parole. He was initially held at Leuven Centraal prison before being moved to Bruges due to health issues. In 2007, when he turned 80, authorities considered moving him to a retirement home.

Ágnes received a 21-year sentence for her role in the murders. Prosecutors sought a longer sentence, but her lawyers argued she was under the influence of her father. In her closing statement, she claimed she had no way out and was completely under his control.

Pándy passed away on December 23, 2013, in the infirmary of Bruges prison. After his arrest, authorities discovered skeletal remains of seven women and one man in one of his properties. The identities of these remains were not determined, and suspicions arose about possible additional victims connected to Pándy. Investigations suggested he and Ágnes might have been involved in other murders before and during the time they harmed their family members, including an unknown number of Romanian children who went missing after being in his care.