As a senior, he played in a run-oriented offense, tallying 23 receptions for 334 yards and 3 touchdowns, while also making 57 tackles (11 for loss), 8 sacks, 2 fumble recoveries and 2 blocked field goals.

As a senior, he appeared in 10 games with 7 starts, while sharing the tight end duties with Nick Eubanks.

McKeon was signed as an undrafted free agent by the Dallas Cowboys after the 2020 NFL draft on April 27.

[4] The team made the unconventional move of keeping him as the fourth tight end to avoid losing him to waivers.

He became the third-string tight end, after the starter Blake Jarwin suffered a season-ending knee injury in the first game against the Los Angeles Rams.

On November 14, 2021, McKeon registered his first NFL reception while playing against his former High School teammate, Chris Lindstrom and the Atlanta Falcons.

On Thanksgiving Day, he caught his first career receiving touchdown, a 10 yard pass from Dak Prescott against the Las Vegas Raiders.

In 2022, with the departure of Jarwin, he was competing for the backup tight end position behind Schultz, but fell on the depth chart behind rookies Jake Ferguson and Peyton Hendershot during training camp.

[8][9] On October 12, McKeon was signed to the active roster to provide depth after an injury to Hendershot.