The teenager's activity on video file sharing site YouTube showed that he watched clips from various soaps and the horror film Saw.
In one video he posted featuring himself, he was excited about a new computer.
He's seen saying:
It has finally happened - I now have an iMac - I can now make bigger and better videos!
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After a relatively mild and quiet night, an episode of rain for many of us tomorrow.
The 34-year-old from Coulsdon in Surrey died during the private party in Headley in the early hours of Monday, Surrey Police said.
The Home Office made the arrests at various restaurants across London on July 4.