Step 1 : Introduction to the question "Who tied the NFL Record with a 99-yard touchdown run in December 2018?"
...It was during the second quarter in the Tennessee Titans' victory (30-9) over the Jacksonville Jaguars that Derrick Henry scored on an amazing 99-yard touchdown run. Derrick's run tied that of Hall of Fame member Tony Dorsett of the Dallas Cowboys. Dorsett set the record in 1983 with his own 99-yard TD run. According to quarterback Marcus Mariota, the play almost didn't happen. He'd originally called for a QB sneak, changing the play at the line to give Dorsett the ball. Source: NFL.com