Details about the life and mental conditioning of "Jihadi John" are slowly coming to fore after the ISIS executioner was unmasked in recent days.

One such detail came out of his email exchanges with Mail on Sunday (MoS), where he described himself as a "dead man walking" in the hands of British Intel.

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Jihadi John, now known as Mohammed Emwazi, exchanged emails with MoS' three years ago, before he left Great Britain to join the Islamic State in Syria.

He told MoS Security Editor Robert Verkaik that he was harassed by members of the British security services.

"Sometimes I feel like a dead man walking, not fearing they may kill me," said Emwazi in his emails.

"Rather, fearing that one day, I'll take as many pills as I can so that I can sleep forever. I just want to get away from these people," he added.

Emwazi said his paranoia started when he met the buyer of the laptop he was selling in the online website Gumtree. He met the prospective buyer at the underground station of Maida Vale, which is near with his West London residence.

"When I sell anything via Internet, I always only write my surname. I went to meet that person so that he could have a look at the laptop and if he is satisfied (sic), he would buy it," said Emwazi in his email.

"That person, to my surprise, did not even bother look if the laptop works or not. Anyway, in a matter of seconds, I gave him the laptop (thinking that he's going to test the laptop). He gave me the money straightaway. We shook (sic) hands and he said 'nice doing business with you Mohammed.' I never told this person my first name and I never give out my first name. It was impossible for him to know my first name," Emwazi narrated.

British security officials downplayed Emwazi's assertions that their handling of the Saudi-born Londoner had pushed him to join the ISIS.

TagsJihadi John, Mail on Sunday, MoS, Mohammed Emwazi, ISIS