Troy Thompson also scored 11 points and J.D. Wallace added seven to go with 14 rebounds for PVAMU (10-16, 7-5 Southwestern Athletic Conference).
The teams combined to miss the first 13 field-goal attempts in overtime, and finished 1 of 14. Hamilton opened the scoring in the extra period when he hit two free throws with 3:19 to play and it was scoreless until he made two more foul shots with 31 seconds left. Hamilton and Jones combined to make 3 of 4 free throws to make it 63-56 with 10 seconds remaining before a dunk by JSU's Paris Collins capped the scoring.
Collins had 18 points on 8-of-24 shooting for the Tigers (10-16, 7-6). Treshawn Bolden scored 16, including three 3-pointers, and Jeremiah Bozeman added 10 points. Bolden made 6 of 6 from the field and Bozeman hit 4 of 5.
The teams, who came in tied for first in the conference in 3-point percentage (35.1), combined to make 10 of 52 (19.2 percent) from beyond the arc and committed 40 total turnovers.
Jackson State has lost three in a row and six of its last seven.
Mannion, who recently reclassified and is ESPN's No.11 overall player in the class of 2019, chose Arizona over Marquette.
He'll fit in with Sean Miller's plans for a faster tempo on offense.
The cream of the crop of American high school basketball will congregate in Colorado Springs from Oct. 5-7, as USA Basketball unveils its newly expanded Junior National Team minicamp in collaboration with the NBA, NCAA and NBPA.