Cox is the true main antagonist of the 2015 action-thriller film The Gunman. He is Jim's former co-boss and the true founder and leader of the assassination organisation, whose in the present ,founded an
international security firm called "Aquila Corp".
He was portrayed by Mark Rylance.
In the film
Mission at the Democratic Republic of Congo
In the film's beginning, Jim Terrier and his assassins team are a special black-ops crew under the cover of an international mining company which providing security to local projects. In 2006, their boss, Cox ,tasks them to end the life of Congo's Mining Minister in order to ensure the team's access to the rich mineral resources.
Present Days
Eight years later, the team was dismissed and Cox himself founded an international security firm called "Aquila Corp". As he found out that Jim wrote a notebook of the entire operations that the team has executed and even took some recording files containing Cox, Cox himself then sent his own assassins to eliminate Jim.
Felix's Reveal
Right after that Stanley, Jim's longtime friend welcomed him and his wife Annie ,Stanley gave him information about Cox's company and his new occupations. He added in his things, saying that Felix is a part of the scheme to kill Jim, and states that Felix wants Annie for himself. Afterward, Jim arrived to Felix's house, there, he confronted him while the latter is overhelmingly drunk. Shortly after this thing, a special team of ex-US Marines working for Cox as his assassins, attacked the house ,what eventually led to Felix's death.
After Felix died, Cox's men kidnapped Annie and he brutally murdered Stanley. Then, Jim gave Cox an ultimatum; let Annie go alive in exchange for Jim's recording files containing Cox giving the team orders back in 2006, what will change the world's look upon Cox's company forever. Cox agrees to the ultimatum and Jim tells him to arrive to a bullfight in Spain.
The Final Showdown
Upon their arrival to the bullfight staduim, Cox ,whose holding Annie as hostage, sends his men to search after Jim. As they are doing it, Jim manages to kill them one by one despite his medical problems. After killing the entire team, including Cox's personal henchman; Reiniger ,Annie saw those things and succeeded to escape. Cox pursues her ,but fails to catch.
Death
Prior to Annie's return to Jim, she accidentally opened the doors that quickly released a raging big black bull. Then, the bull stormed to get out for freedom, and ended up with sticking his horns inside Cox's chest and body, brutally killing him.
Personality
Cox is a very corrupt person, who cares about getting his orders get done and doesn't want any disturbing incidents. Despite being very corrupt, he is also an extremley powerful and ruthless individual, who even antagonized Jim and brutally murdered his best friend Stanley and also he drugged Annie.