Is it possible to disable the deathcam?
It is not possible to disable the Deathcam in TF2 per-player.
Maybe it used to be, since there's a lot of mention of a console command called cl_disablefreezecam 1 across the internet, but there's about an equal amount of people saying it doesn't work.
There is a very good reason you can't disable it, of course: it would mean players couldn't get Freeze Cam based achievements against you.