There is such thing as immortality.
HeLa cells keep growing and growing and growing and they are human cells outside of the body.
They came from a woman named Henrietta Lacks.
There's a book about her called The Immortal Life of Henrietta Lacks.
Another immortality are memories of a deceased person. Their life has become legends and they are remembered, which in a way makes them immortal.
Take Beowulf, Jesus, Michael Jackson, Tupac for examples.