Vishnu means all pervasive and he is free from the cycle of birth and death. He never takes birth and nor is destructible. He is also the Lord of the past, present and future and is also a supersoul. As per Hindu ceremonies, everything starts with Vishnu and ends with him.
Even God\'s like Indra, Varuna, Vayu, etc. do not die. Since all the God\'s have celestial bodies, they lack bones and skins and remain immortal. Then they merge into the universal body of Narayana and they remain free from disease and death.