He can't. They are mutually exclusive as they both require different states of mind.

EDIT: So reading the article it looks like they can, he was found guilty of murder in the third degree, and manslaughter in the second degree. I assume he was found guilty of manslaughter for his negligence and third degree murder for his depraved indifference to life. It seems very strange to me however as normally one would exclude the other, and it is entirely possible while he was found guilty of both he will only be sentenced for one as the other would often be considered a lesser included charge.