Presuming that his repentance was real, he couldn’t have dreaded death too much. It would have to seem like a welcome break after the mental nightmare he must experience every day knowing what he did.
Hopefully he came to know the truths in this hymn:
I have been at the altar
and witnessed the Lamb
Burnt wholly to ashes for me;
And watched its sweet savour
ascending on high,
Accepted, O Father, by Thee.
And lo, while I gazed
at the glorious sight,
A voice from above reached mine ears:
“By this thine iniquity’s taken away,
And no trace of it on thee appears.
“An end of thy sin has been
made for thee here
By Him who its penalty bore;
With blood it is blotted eternally out,
And I will not remember it more.”
O Lord, I believe it
with wonder and joy;
Confirm Thou, this precious belief;
While daily I learn that I am, in myself,
Of sinners the vilest and chief.