The stepfather of a child murdered by a thrill killer who posted a video and photos of his victim on the Internet has told how he found the boy in the cellar of the house next door.
Jaden, nine, was lured into the house in the German town of Herne by 19-year-old Marcel Hesse who is now being hunted by Interpol across the continent.
Police say Hesse, a martial arts fanatic, stabbed Jaden in the cellar and recorded the brutal murder. It is unclear whether there was a sexual motive.
Pascal R, 34, said: 'The picture of my stepson lying there dead...I will never forget this. I found him lying in a giant lake of his own blood.'
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Interpol are helping in the search for Marcel Hesse, 19 (pictured, left), a bespectacled martial arts enthusiast, who allegedly carried out the murder at his home in the town of Herne (right)
Detectives on a specially formed murder squad believe Hesse may have killed another person.
They said he appeared on an Internet chat room in the hours following the killing to say he had attacked a woman, adding: 'She offered more resistance than the child.'
He mentioned using 'torture' to get the woman's bank details and pin number.
Hesse had lived in the house where he killed Jaden for many years with his parents, but he was home alone since the beginning of the year with his sister Sandra after his mother and father moved.
Jaden's mother Jeanette F, 41, told the Bild newspaper in Germany; 'Sandy told us once that her brother was an absolute psycho.'
Pascal told the paper; 'We had been shopping, my wife and I. Maurice and Steven, his stepbrothers, and Jaden stayed at home.'
The body of the boy was discovered by police in the cellar of a house by his stepfather
He said he had been told that at 6pm on Monday evening the doorbell rang and Hesse asked Jaden if he could come to his home to help him set up a pair of ladders.
When the parents returned home two hours later Jaden had not returned home.
Pascal said: 'I went over and banged and yelled but no-one answered.
'Something bad has happened,' Jeanette remembered saying to her husband.
Pascal and his stepsons entered the cellar and saw Jaden, who had been stabbed more than 40 times.
'I wanted to give him a massage on his heart but blood was streaming from his wounds,' said Pascal.
Police said the boy was stabbed as Hesse filmed his demise and posted video and stills on the so-called Darknet - the lurid, unpatrolled side of cyberspace specialising in pornography, paedophilia, drugs and 'snuff movies'.
Police stand guard outside the house in the town of Herne where a nine-year-old boy was brutally murdered
It was a Darknet user - who claimed to know the killer - who contacted police to tell them: 'I have just seen a boy murdered on the Internet.'
The killer entered a chatroom after the murder and held his bloodstained hands up to the camera.
Police say Hesse is dangerous and warned the public not to approach him.
Several cities in the old Ruhr valley industrial area of Germany were being searched by police today.
Hesse fled in camofulage clothing. Police admit they have little idea where he may have gone to or what twisted motive he had for the crime.
A huge manhunt is underway, but police admit they have little idea where the suspected killer may have gone
Several cities in the old Ruhr industrial area of Germany, where Herne (pictured) lies, were being searched by police on Tuesday morning