Khalil Ibn Rountree Jr. (born February 26, 1990) is an American professional mixed martial artist who currently competes in the Light Heavyweight division of the Ultimate Fighting Championship (UFC).

When he was two years old, his father was shot and killed in an attempted robbery while working as the tour manager for Boyz II Men.

[7] Before his UFC 236 fight against Eryk Anders, Rountree trained in Thailand, focusing on Muay Thai.

[8] Rountree had a record of 6–1 in his amateur fights, competing as a Middleweight under the Tuff-N-Uff and King of the Cage (KOTC) banners.

[9] Rountree made his professional debut, as a light heavyweight, with Resurrection Fighting Alliance against Livingston Lukow at RFA 15 on June 6, 2014.

[10] Rountree was scheduled to face Blake Troop in a 190 lbs catchweight bout at RFA 21 on December 5, 2014.

[17] Later in the show, Hendricks withdrew himself from the competition due to neck injury and Dana White decided to bring back Rountree for the semi-final round.

[19][20][21] Rountree made his promotional debut on July 8, 2016 at UFC The Ultimate Fighter 23 Finale for the TUF 23 Light Heavyweight title against Andrew Sanchez.

[22] Rountree next faced Tyson Pedro at UFC Fight Night: Whittaker vs. Brunson on November 27, 2016.

[26] Rountree faced Paul Craig on July 16, 2017 at UFC Fight Night: Nelson vs.

[35] Rountree faced promotional newcomer Johnny Walker on November 17, 2018 at UFC Fight Night 140.

[43] Despite talks of retiring after the scrapped bout with Alvey, Rountree signed a contract extension with the UFC in October 2020.

[60] However, Murzakanov suffered from symptoms related to Pneumonia and was removed from the event, and Rountree was instead booked to face Anthony Smith one week later at UFC Fight Night 233.

[64] However, Rountree was forced to withdraw from the event due to taking a banned substance,[65] and was replaced by Carlos Ulberg.

[66] Rountree was subsequently suspended by the CSAD for 2 months from May 4 to July 4, 2024 from competing for taking banned substances - Exogenous origin of 5a-androstanediol, 5b-androstanediol and androsterone.