Demonic Soul Sealing Technique
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The Fourth hokage died protecting Konoha from the nine tailed fox. The jutsu used to seal the Kyuubi in Naruto killed him in the process.
Hiashi Hyuuga
Prior to Naruto being Kyuubi's jinchuuriki, Naruto's mom, Uzumaki Kushina, was Kyuubi's second jinchuuriki. When Naruto was born the seal grew very weak and Madara managed to break the seal and use the Sharingan to control Kyuubi's mind and force him to attack Konoha. Nobody really sent him, he was freed from his seal but then the Yondaime sealed him into Naruto.
His mom died because she was kidnapped by Tobi (who had threatened to kill naruto first) and had the kyuubi inside of her (the nine tails) taken out of her. But because she inherited the longevity life of her clan she was able to survive for a few moments after the nine tails was extracted from her(most jinchuriki just die instantly after having their kyuubi extracted from them). Naruto's dad died because he used the dead demon seal to seal the nine tails in naruto and the user who casts the jutsu dies afterwards.
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.