Poignant Poem In Mystery Novel

A Killing At Ball's Bluff by Michael Kilian, had character (the real life) Oliver Wendell Holmes reading lines from the poem written by his father, Oliver Wendell Holmes, entitled The Last Leaf:

"The mossy marbles rest
On the lips that he has pressed
in their blooms;
And the names he loved to hear
Have been carved for many a year
On the tomb."