depends on the Nevada state law, Texas has something similar in TPC 19.02(b)(2), the murder statute, but it would not apply in Ruggs case due to no intent to cause SBI
(b) A person commits an offense if he:
(1) intentionally or knowingly causes the death of an individual;
(2) intends to cause serious bodily injury and commits an act clearly dangerous to human life that causes the death of an individual; or
(3) commits or attempts to commit a felony, other than manslaughter, and in the course of and in furtherance of the commission or attempt, or in immediate flight from the commission or attempt, he commits or attempts to commit an act clearly dangerous to human life that causes the death of an individual.
State could get creative if they could find an underlying felony in NV to use the felony murder rule, assuming they have it, like if Racing on a Highway were a felony (in Texas it is, if you have 2 priors)
Otherwise you'd have to go with Manslaughter, which is also a second degree felony, no better than Agg Assault