Can a person die before their lifespan ends?


So we all know, that everyone in Death Note has a lifespan and one day,
they'll die when their lifespan runs out. But doesn't that mean, that the
victims who get killed by a serial killer are destined to being killed by him?
Or are their deaths destined the moment a serial killer decides to kill them?




The people can be killed before their lifespan ends using Death Note. The
lifespan of a person is decided by fate and doesn't keep on changing, like
when a serial killer decides to kill that person, his lifespan changes. No,
the lifespan is already decided, so if the lifespan is already short the
serial killer succeeds; if it isn't, the serial killer fails. Also, if a
Shinigami writes someone's name which in turn increases the lifespan of
others, that Shinigami dies. Humans don't have this problem while using Death
Note.

