The last phrase is textually difficult, and translations divide over how much it claims.
Quick answer
The chapter closes on a road with life on it. How far the second line reaches is genuinely debated.
Read both lines
The first line gathers the whole chapter, which has been contrasting two roads since verse 3, and puts life on one of them. The second line is where the difficulty sits. The Hebrew as preserved reads something close to "and the way of its path, no death," and translators divide: some render it as the absence of death on that road, some as "immortality," and others emend slightly to read the opposite, that another path leads to death. The version in front of a reader may claim a great deal or very little.
Why translations differ
The final phrase is one of the more contested in the book, and the honest report is that the text is hard rather than that one rendering is obviously right. This is the third certainty register: the expression is debated, and it cannot responsibly be made to carry a developed doctrine of the afterlife on its own. What the verse plainly establishes is what the whole chapter has been saying, that the road of righteousness is the road where life is found. Whether the second line reaches past this life is a question a difficult phrase cannot settle, and the catalog does not build on it in either direction.
Related: Proverbs 12:3 · Proverbs 11:19 · Proverbs 10:2
New King James Version®, Copyright © 1982, Thomas Nelson. All rights reserved. Full copyright information. Scripture provided by API.Bible.
Go Deeper
If this verse has been used to put weight on you that it was never carrying, ask about it directly.