A slighter more extreme, (but perhaps not so visually) version of a '
Metalhead'. Appearance and attitude do not really differ much from that of a normal 'Metalhead'. (However there are of course exceptions). The stereo-typical extremities that I have observed are usually; a more blunt/brash attitude towards things, wear clothing promoting heavier bands, tend to be more violently inclined and a lot more temperamental and of course, primarily listen to death
metal. (Though not just that style, they do listen to other styles of
music, no one listens to just one genre.)
On the contrary to dick behind the genius that is the only other
definition, Death Metallers are not anti-social. Quite the opposite, many of them either spending their time with friends or families, or down the pub. They also attend concerts and festivals quite regularly which entails being in contact with thousands of other
people.
In short, a Death Metaller is a slightly more violent and free willed version of a Metalhead. Visually almost identical to a metalhead, (the only way to tell the difference is if your into
metal.)