Did Methuselah die in the flood or before it?

I believe the evidence points to him dieing in the flood. There is no mention that he walked with God himself, in fact though he was still alive when God first spoke to Noah, God said Noah was the only righteous man on the earth at that time. And being a righteous man, I believe Noah would have petitioned God to spare his father as well, if he too were walking with God. My response to those who say Noah would have asked God to save his father as well, I also don't believe the reason Noah didn't ask God about him was that he had already died. Noah, had brothers and sisters, and he didn't speak to God about them either, and they were still alive at that time, too.