Early career After ending his
college wrestling career, McKinney made his amateur
mixed martial arts debut in August 2016, winning by knockout fifteen seconds into the first round. A year later, he would turn professional, and went on to compile a 7–1 record before appearing on
Dana White's Contender Series 21 in July 2019, losing by knockout to
Sean Woodson.
Ultimate Fighting Championship Eight days after a first round knockout win in the headliner of
LFA 109, McKinney made his promotional debut against
Matt Frevola on June 12, 2021, at
UFC 263, replacing an injured
Frank Camacho. After the event, UFC president
Dana White announced that even though McKinney did not receive an official
Performance of the Night bonus, he would receive an unofficial one. On February 26, 2022, McKinney faced
Farès Ziam at
UFC Fight Night 202, earning a victory via rear-naked choke in the first. In a fourteen-day turnaround, McKinney stepped in short notice to take on
Drew Dober on March 12, at
UFC Fight Night 203, replacing an injured
Ricky Glenn. McKinney knocked down Dober twice within the opening minute, but ultimately lost the fight via technical knockout in round one. McKinney faced Erick Gonzalez on August 6, 2022, at
UFC on ESPN 40. He won the fight via a rear-naked choke submission in round one. McKinney faced Ismael Bonfim on January 21, 2023, at
UFC 283. He lost the fight via a flying knee knockout in the second round. McKinney next faced
Nazim Sadykhov at
UFC on ESPN 49 on July 15, 2023, losing the fight via a rear-naked choke submission in the second round. Replacing
Lando Vannata, McKinney took a short notice fight with Mike Breeden on August 12, 2023, at
UFC on ESPN 51. He won the fight via technical knockout in round one. McKinney was scheduled to face Chris Duncan on October 14, 2023, at
UFC Fight Night 230. However, Duncan withdrew due to visa issues, and was replaced by promotional newcomer Brendon Marotte. McKinney won the fight via technical knockout just twenty seconds into the bout. McKinney faced
Esteban Ribovics on May 11, 2024, at
UFC on ESPN 56. He lost the fight early in the first round by knockout via a head kick. McKinney was scheduled to face an opponent to-be-announced on October 12, 2024 at
UFC Fight Night 244. However, his name was removed from the card for unknown reasons. McKinney faced
Damir Hadžović on February 1, 2025 at
UFC Fight Night 250. He won the fight by technical knockout via ground-and-pound in the first round. McKinney faced Viacheslav Borshchev on June 28, 2025 at
UFC 317. He won the fight via a guillotine choke submission within the first minute of the first round. McKinney faced
Chris Duncan on December 6, 2025, at
UFC 323. He lost the fight via an anaconda choke submission in the first round. McKinney faced
Kyle Nelson on March 28, 2026 at
UFC Fight Night 271. He won the fight via technical knockout 24 seconds into the first round. == Professional grappling career ==