it's just the result of the jutsu
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he died after sealing the nine-tailed fox into naruto. naruto didn't know either of his parents.
The one on his stomach was the seal used to imbue the Nine-tailed Fox demon inside him. It is a Reaper Death seal. This is a jutsu that his father, the Fourth Hokage, used to take away some of the fox's power by sealing it within Naruto.
naruto dad dies when sealing the nine tails in naruto when he was a baby and in the shippuden episode naruto's dad is just a spirt in naruto's body gurding the seal so he can't stay with naruto forever like that and naruto came out the nine tail chamber inside him but his dad's spirt stayed there.
there are 9 tailed beasts (demons) . but they have been taken by the akatsuki. naruto is the nine tailed beast.
Naruto's dad used part of his chakra and his wife's (naruto's mom) chakra to seal the Nine-tailed fox inside Naruto. They aren't the seal but they are there to help Naruto control the demon fox. Naruto's dad saves naruto from being overwhelmed by the fox, and in the most recent manga (495 or thereabouts) his mom helps him defeat the fox.