The common law crime of arson has been abolished (Crimes (Criminal Damage) Act 1978 s3).
A person is guilty of arson if he or she commits the offence of arson as defined in s197, and thereby causes the death of another person (Crimes Act 1958 s197A).
Consequently, the elements of arson causing death consist of:
The elements of the relevant offence under ss197(1), (2) or (3);
That the damage or destruction occurred by fire;
That the accused intended to damage or destroy the property by fire;  and
That the accused’s acts caused a person’s death.
The prosecution does not need to prove that the accused intended to cause the death, or was reckless as to that result. It is sufficient to prove that the accused had the mental state necessary for the offence of arson, and that death resulted.
See the following topics for information concerning the elements of ss197(1), (2) and (3):
See Arson for information on causing damage or destruction by fire and an intention to cause damage or destruction by fire.
See Causation for information concerning what it means for the accused’s acts to have "caused" a person’s death.
 It is unclear whether the accused must intend to damage or destroy the property by fire, or whether a general intention to cause damage is sufficient. As a matter of prudence, it is assumed that the more specific intention is required. This is the approach taken in G Williams, Textbook of Criminal Law, 2nd ed, 913 and R v Cooper (G) and Cooper (Y)  Crim LR 524 . But compare A Ashworth, "Transferred Malice and Punishment for Unforeseen Consequences" in P Glazebrook, Reshaping the Criminal Law (1978), 92.