John Steele Hill[3] (July 8, 1941 – March 10, 2010) was a Canadian professional wrestler best known under the ring names Guy Mitchell, The Stomper and "Gentleman" Jerry Valiant.

Hill became a professional wrestler in 1959 after working out for a year at both Al Spittles's and Jack Wentworth's gyms in Canada.

[5] Under his new identity, Mitchell held the Georgia version of the NWA Southern Heavyweight Championship for one week.

[5] After wrestling as a heel for four years in Toronto, The Assassin feuded with The Sheik, losing a death match in July 1971.

The Sheik won the match and removed The Assassin's mask, revealing him to be Guy "Stomper" Mitchell.

[4][10] The team feuded with The Fabulous Kangaroos (Al Costello and Don Kent), who were managed by George "Crybaby" Cannon.

They held the belts for five months, and The Stomper had one last reign as champion when he teamed with Bobo Brazil to win the title for the third time on July 21, 1973.

He returned as a solo prelim wrestler and referee in 1984 when the WWF would use his ring at shows in Indiana, Missouri, Michigan and Kansas.