The police have offered AU$1 million in reward for information on the unsolved murder of Melbourne girl Karmein Chan on the 25th anniversary of her abduction. Chan, then 13 years old, was abducted from her home in Templestowe on April 13, 1991 and found dead a year later.

Karmein was kidnapped by a man in a balaclava while her parents had gone to work at a Chinese restaurant. The man forcibly put the two younger sisters of Karmein in a wardrobe before fleeing with her.

A year later, her body was discovered at Edgar’s Creek in Thomastown and the autopsy showed she was shot.

The man, dubbed as “Mr. Cruel,” was also allegedly responsible for at least four cases of child kidnappings and sexual assaults in Melbourne between the 1980s and 1990s. Two of the girls kidnapped by the man were released. Unfortunately, Karmein’s dead body was found by the creek with a bullet shot wound in her head.

According to Victoria Police Assistant Commissioner Stephen Fontana, the key to the unsolved murder is someone from the public.

“This unsolved murder has been extremely devastating to the Chan family,” the ABC quoted him as saying in a statement. “We are hoping that today’s $1 million announcement will encourage someone out there with crucial information or direct knowledge of this murder to come forward.”

Around 100,000 pieces of information were investigated by the original task force. The observations were re-investigated by a second investigative team between 2010 and 2013. It dismissed a number of places of inquiry and eliminated several possible suspects, Skynews reported.

The police said that until the cases on Mr. Cruel remain unsolved, they won’t be closed. According to a former police officer who was a part of the investigation, it is speculated that the so-called “Mr. Cruel” may still be alive now.

The Director of Public Prosecutions will grant anyone with information on the Karmein Chan murder indemnity from prosecution, the police said.