Started all 19 games at Arkansas and made 134 tackles, 16.5 for loss with 6.5 sacks, three quarterback hurries, three pass breakups, two fumble recoveries, one forced fumble and one interception.
Highsmith was elected a team captain and started the first six games before an injury ended his season. He recorded 54 tackles, 4.0 for loss with 2.0 sacks, one fumble recovery, one quarterback hurry and one pass breakup. At the time of his injury, his 54 tackles ranked second in the SEC and his average of 9.0 tackles per game was tied for fourth in the conference. Highsmith made a career-high 15 tackles, including a career-high-tying 2.0 for loss, vs. Rutgers. He made seven tackles and one fumble recovery in the season-opening 49-24 win vs. Jacksonville State. He made eight tackles, 1.0 for loss with 1.0 sack, vs. ULM and the next week recorded 10 tackles vs. No. 1 Alabama. He followed his career-high performance vs. Rutgers with 11 tackles and one quarterback hurry at Texas A&M. He made three tackles, 1.0 for loss with 1.0 sack, and one pass breakup at Auburn before suffering his injury in the second quarter.
Started all 13 games of his first season at Arkansas and finished the season first on the team and 10th in the SEC with 12.5 tackles for loss. He recorded 80 tackles, including 12.5 for loss with 4.5 sacks, two quarterback hurries, one forced fumble, one fumble recovery, one interception and one pass breakup. His sack total was second on the team, and his tackle total ranked third on the team. He made a career-high 12 tackles, including a career-high-tying 2.0 tackles for loss, in the 38-14 win vs. No. 15 Auburn. He scored his first touchdown as a Razorback on a 47-yard fumble return and also made seven tackles with 0.5 sack at No. 1 LSU. He opened the season with four tackles and 2.0 for loss, which was the third-highest TFL total by an SEC player in the season's first week, in a 51-7 win vs. Missouri State. The next week, he started a stretch of six straight games with at least five tackles by making five stops in the 52-3 victory vs. New Mexico.
He made five tackles, 1.0 for loss, in the 38-28 win vs. Troy. At No. 3 Alabama, Highsmith recorded eight tackles, 2.0 for loss and 1.0 sack. He made seven tackles, 0.5 for loss, in the come-from-behind 42-38 victory vs. No. 14 Texas A&M before his 12-tackle performance against Auburn. He made six tackles, 1.5 for loss with 1.0 sack that resulted in a 23-yard loss in a 29-24 win at Ole Miss. The next week, he accounted for one tackle and forced one fumble in the 31-28 victory at Vanderbilt. He recorded six tackles, 1.0 for loss with 1.0 sack, and one interception in the 44-28 win vs. No. 10 South Carolina. He made nine tackles and one pass breakup in the 49-7 victory vs. Tennessee and the next week accounted for three tackles and one quarterback hurry in the 44-17 win vs. Mississippi State. He ended the season with seven tackles, 2.0 for loss with 1.0 sack, and one quarterback hurry as Arkansas defeated No. 11 Kansas State 29-16 in the AT&T Cotton Bowl.
Born Nov. 21, 1989, he is the son of Alonzo Highsmith and Shwayne Sesler. His father played running back for the University of Miami and had a seven-year NFL career and his brother A.J. is currently a safety at the University of Miami. Alonzo is majoring in sociology.