That's just the thing though, plenty of people are "beheaded" through criminal acts who are in no way related to the Islamic faith.
No. They're not. Beheading are virtually an Islamic exclusive, especially in the West in populations centres with lots of Mohamedans, much like London.
The journalistic use of the word "beheaded" rather than the journalistic standard:decapitated is to play on his religious affiliation or to point to religion as a motive for the act which is likewise what individuals responding to this thread assumed, and yes that's silly.
There exists no such "journalistic standard". What are you gonna do, break out the AP "stylebook" to tell us how to document the truth? The relationship between these events and Islam is obvious. You're clearly trying to run interference for Islam/Mohamedans and it's pathetic. Please stop insulting the intelligence of the rest of us.