Light’s Temporary Relinquish of Death Note and Memory Loss
Because the actions of Misa Amane, a fervent Kira supporter and fellow Death Note owner, nearly implicates Light, he becomes compelled to temporarily relinquish ownership of his notebook and subsequently loses his memories of using the Death Note.
Ryuk’s Decision and Consequences
He had expected Light might have thought of some way out of his situation, but seeing as he is desperate enough to go to Ryuk for help, Ryuk decides it is all over for him. Ryuk returns to the Shinigami Realm after killing Light. When Light gets killed at the end, the world or Lights family never get news who was Kira and his identity was never revealed. They probably just told them that Light had been killed by Kira because he was assisting with the Task Force.
Light and L: A Comparison
L is arguably the most popular and beloved character in the series, even more so than Light Yagami. He is also the one person who was able to go up against Kira and nearly win. L was born in 1979. They were 7 years apart in age. Light dies at the age of 23. L dies at the age of 25.