[4] He attended Roosevelt High School in Wyandotte, leading their ice hockey team to a state championship in 2011.

[7] After being re-signed for another season, Mayhew put up 60 points in 71 games, and was rewarded with a two-year, two-way contract by the Minnesota Wild, Iowa's National Hockey League affiliate, on May 10, 2019.

[9] Leaving the Wild organization after five seasons, Mayhew was signed as a free agent to a one-year, two-way $800,000 contract with the Philadelphia Flyers on July 28, 2021.

Recalled to the NHL, Mayhew featured in 25 games for the struggling Flyers, recording a career best 6 goals, before he was claimed off waivers by the Anaheim Ducks on March 20, 2022.

As a free agent leading into the 2024–25 season, Mayhew was belatedly signed to a one-year AHL contract with the Rockford IceHogs, affiliate to the Chicago Blackhawks, on October 27, 2024.