From the very early stage when I started doing performance art in the '70s, the general attitude - not just me, but also my colleagues - was that there should not be any documentation, that the performance itself is artwork and there should be no documentation.
While his history of depression is compatible with suicide. . . and the location and direction of the stab wounds are consistent with self-infliction, several aspects of the circumstances (as they are known at this time) are atypical of suicide and raise the possibility of homicide.