It is possible to die from Lyme disease, though it is very uncommon. If left untreated, lyme disease can cause inflammation of the heart muscle leading to an irregular heart beat and ultimately death. For more information, visit http://whatcanyoudiefrom.com/lyme-disease/.
Oh, yes. It is more likely to leave all kinds of residual damage to the neurological and heart damage. It is also difficult to diagnose. If you live in an area with ticks, always suspect it if you have an unusual illness.