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> over complicated way to kill someone.

What if the person was killed first with another simpler method, and the electric saw was used after, for disappearing purposes?

"Some time after, the assailant killed Mr. Saleh, decapitated him and dismembered his body with an electric saw."

I considered this but it was still naive of the attacker to think he could avoid CCTV.

I don't think naivety rules out professionalism. Perhaps he normally works in a location where CCTV footage never makes it to court.