In 1997, he suffered a sprained knee injury in the preseason finale against the Cincinnati Bengals and missed the first 4 games of the regular season.
In the ninth week against the Oakland Raiders, he had 4 receptions for 100 yards and one touchdown, marking his first career 100-yard receiving game.
[3] McKnight spent the 1999 season on the injured reserve list, after tearing the anterior cruciate ligament in his left knee during the Blue-White scrimmage on August 5.
On March 16, 2001, he signed as a free agent with the Miami Dolphins, reuniting with offensive coordinator Chan Gailey, who was his head coach with the Dallas Cowboys.
In 2002, he was relegated to a reserve role after Oronde Gadsden passed him on the depth chart, finishing with 9 starts, 29 receptions for 528 yards and 2 touchdowns.
He currently coaches football and track & field at Calvary Christian Academy (Fort Lauderdale, Florida) working with the wide receivers.