Jack had been a commitment to Troy since November, but he said that changed after his visit to Hattiesburg this past weekend.
" Southern Mississippi's facilities were awesome and everything just felt like home and I will be closer to my home town, George County, which will be great more of my family can watch me play at the next level," Jack told JCFootball.com recently. "The visit was great. The food was good, everyone treat each other like a big family and they just got a new locker room built which was pretty cool.
"They showed a lot of love towards me."
As a sophomore this past season, Jack locked down one side of the field for the Pearl River defense, finishing with a team-leading nine pass breakups while posting 29 tackles and two interceptions.
Jack will finish up his two-year degree in May and he will have three years to play two starting this fall.