This sentence is interrupted by gun shots. The character died before the album dropped, but he wants Kendrick to sing about him. Kendrick’s fulfilling his last wish.

This line also speaks to the idea that if you continue down that path of violence like Dave’s brother, it’ll end up killing you, hence the gunshots interrupting mid sentence, showing us it could happen at any point, unexpectedly. This causes the listener to experience the sudden and jarring halt that is death in a smaller but still immediate sense.

The fact he’s murdered mid-sentence more broadly signifies he was killed before he was able to give all he had to give. It wasn’t enough his life was cut short, even his sentence is as well; death robs him of everything.

Also note that the shots come in right when Dave’s brother says “I hope”, signifying that there is no hope for kids like him in the ghetto and also, since he is cut off before he could express that hope, the line alludes to the ways violence destroys hopes and dreams, no matter how small before they can be realized.

NOTE: The same idea is used in M.A.A.D city when Kendrick says “If Pirus and Crips all got along, they’d probably gun me down by the end of this song”, saying that people like him live in such a dangerous place that they might get shot unexpectedly at any time, even when recording a song.