As he walked up the steps at Tower Bridge, the IT consultant glanced into the muddy waters of the Thames below.
He could see what looked like a mannequin floating in the water. Looking closer, he realised with horror it was, in fact, a small headless body, wearing red shorts.
The 2001 discovery went on to plunge the police into an international case based on ritual sacrifice and strange cults who still believe eating human flesh can give them great power.
Twenty years on, the murder of the child – who police called Boy Adam and who was aged between four and seven – remains unsolved, despite hi-tech forensic science revealing glimpses into his tragic life.
The body had been in the water for around ten days. The shorts he was wearing from Kids & Company' could only be bought in a small number of shops in Germany.
Seeds found in his gut showed Adam had been fed drugs from two plants which are used in witchcraft ceremonies in West Africa.
The drugs would have paralysed Adam but not prevented him feeling pain.
Although there was no signs of him being physical or sexually abused, and he had been well fed, he died from having his throat slit and his arms, legs and head had all been expertly amputated. The rest of his body has never been found.
An analysis of minerals in his stomach showed the boy had only been in the UK for a few days. Bone marrow tests proved he had been born in Benin City in southern Nigeria.
Experts soon came to a horrifying conclusion. He had been brought to the UK as a human sacrifice.
Some experts suggested he had been murdered in a Muti sacrifice where body parts are boiled up into potions for witchcraft ingredients. Others said he was a victim of a secret sect which believes human sacrifices and incest give people power.
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Nigeria and other parts of Africa have long been blighted by claims of human sacrifice.
Numerous official reports have shed light on some of the horrifying beliefs and cases linked to the practice.
It is believed children's body parts bring more luck and prosperity than those of adults.
In South Africa, it has been claimed around 300 such murders take place each year with different body parts being used for different purposes.
Hands are said to help businessmen get new customers while genitals are a source of good luck.
An official report from a human rights charity in Mozambique told how a woman who wanted to fall pregnant went to a witchdoctor and was advised to wear a belt with children's fingers and penises hanging from it, and was also told to fry and eat pieces of a human heart she was given.
It was also reported fishermen use children's belly buttons in their nets to improve their catch.
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An official report from a Ugandan charity said child sacrifice for witchcraft was common, while in Nigeria critics of the country's elite allege human sacificies are carried out in the belief they will help them remain in power.
But thousands of miles from Africa, UK police are still trying to solve the crime.
One Nigerian woman from Benin, who was living in Glasgow, was questioned in 2002 after police searched her home and found clothes with the same German Kids & Company label and in the same sizes as Adam's orange shorts. She had also previously lived in Germany.
She claimed she was involved in a cult known as the Black Coat Eyes of the Devil Guru Maharaj, and said her estranged husband had been involved in a string of child sacrifices.
However, she was suffering from mental health issues and there was no concrete evidence linking her to Boy Adam. She was subsequently deported.
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One of only two contacts on her phone was next under the spotlight. At his home, officers found an animal skull pierced with a nail, liquid potions, and small packets containing what appeared to be sand or earth which were linked to Nigerian rituals.
There was also a videotape labelled "rituals" which showed a man being beheaded. He was jailed for people smuggling and also deported.
But Boy Adam's killers remain free.
Detective Chief Inspector Kate Kieran, a murder detective from the Met's specialist crime command, said: "This young boy has not and will not be forgotten. He deserved better and we will not give up on him."
Anyone with information relating should contact police on 101, Tweet @MetCC or call Crimestoppers anonymously on 0800 555 111.
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