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He was 55, married, highly qualified as a scientist working in IT, professional and, it later emerged, an Oxford graduate.
And yet when officers from the Paedophile Unit raided his home, they found nearly 20,000 indecent images, including video-clips of a 17-month-old baby being assaulted.
Having worked alongside them for so many months, I am hugely impressed with their professional commitment and their determination to secure a conviction on the most serious charge they can.
After the excitement of a successful arrest, this, they say, is where the real work begins.
Yes, child protection officers do still come across the sad and dangerous individuals who could be described in that way, but increasingly they are arresting a new breed of paedophile.
Lintern later confessed that the man assaulting the baby in the videoclips was, in fact, himself - an admission that no doubt contributed to him being ordered to be detained indefinitely when he came before Southwark Crown Court earlier this year.
What's brought about this seachange in both the number of paedophile and the backgrounds they come from, of course, is the internet.
Often, it is the investigation which follows the suspect's arrest on one of these charges that unearths evidence of even more serious crimes.
Such is the burden of proof that Paedophile Unit investigators are able to assemble that, more often than not, the defendants plead guilty.
Now a paedophile can be chatting to a vulnerable young teenager - even watching her on a webcam - after just a few clicks of his mouse.