New Revised Standard Version
The slayer shall remain in that city until there is a trial before the congregation, until the death of the one who is high priest at the time: then the slayer may return home, to the town in which the deed was done.’”

Contemporary English Version
The citizens of that Safe Town must come together and hold a trial. They may decide that the victim was killed accidentally and that the accused is not guilty of murder. Everyone found not guilty must still live in the Safe Town until the high priest dies. Then they can go back to their own towns and their homes that they had to leave behind.

New American Bible
Once he has stood judgment before the community, he shall live on in that city until the death of the high priest who is in office at the time. Then the killer may return home to the city from where he originally fled.

Douay-Rheims Bible
And he shall dwell in that city, till he stand before judgment to give an account of his fact, and till the death of the high priest, who shall be at that time: then shall the manslayer return, and go into his own city and house from whence he fled.

And he shall dwell in that city, till he stand before judgment to give an account of his fact, and till the death of the high priest, who shall be at that time: then shall the manslayer return, and go into his own city and house from whence he fled.

until

Numbers 35:12,24,25 And when the fugitive shall be in them, the kinsman of him that is slain may not have power to kill him, until he stand before the multitude, and his cause be judged. . . .

Hebrews 9:26 For then he ought to have suffered often from the beginning of the world. But now once, at the end of ages, he hath appeared for the destruction of sin by the sacrifice of himself.