a dwarf star
A neutron star is already the remains of a massive star that has run out of fuel.
Neutron stars do not have fuel. A neutron star is a remnant of a star that has already died.
Such a star will first have a supernova explosion, due to instability in the nucleus. Then it will most likely turn into a black hole.
The death of a star occurs when its nuclear fusion processes can no longer sustain the outward pressure generated by the energy produced in its core. This can lead to the star collapsing under its own gravity, culminating in a supernova explosion or the formation of a white dwarf, neutron star, or black hole depending on its mass.
Usually the fact that the star runs out of fuel.
helium
True. As a star runs out of nuclear fuel in its core, the balance between pressure and gravity is upset. This can lead to the core collapsing and triggering other nuclear reactions in different regions of the star, which in turn can cause the star to undergo changes in its internal structure and mechanisms for producing pressure.
Bellatrix is a fairly massive star, so it may well turn into a black hole. However, it is hard to predict whether an individual star will turn into a black hole; what matters is not the current mass, but how much mass is left over at the end of a star's life, once it runs out of fuel - possibly after a supernova explosion, which may blow much of the star's matter into space.
A star can lose its shine as it runs out of fuel and expands into a red giant, or collapses into a white dwarf, neutron star, or black hole. This process is part of the star's natural life cycle and can result in changes in its brightness and appearance.
Does it turn over? Compression, Fuel, Spark?
red giant
When a Star runs out of fuel, it will expand into what is known as a "Red Giant". Massive stars will become "Red Supergiants". This phase will last until the star exhausts its remaining fuel. At this point, the pressure of the nuclear reaction is not strong enough to equalize the force of gravity and the star will collapse. Go to related link to read more about Stars... ;)