Kelly grew up in Las Vegas, Nevada, and attended Bishop Gorman High School.

[2] Kelly was rated a three-star recruit and committed to play college football at Stanford over offers from Arizona State, Cal, UCLA, Oregon, and Utah.

Kelly was named second team All-Pac-12 after making 58 tackles with a league-high 13 passes defended and two interceptions during his junior season.

[13] On November 15, 2023, Kelly was claimed off waivers by the Green Bay Packers.

[17] On September 10, Kelly was signed to the Las Vegas Raiders practice squad.