I don"t know... that warden looks to be enjoying himself way too much to justify what actions he may, or may not, have taken. that picture, to me, is like a cop in riot gear posing for a picture, big grin on his face, with his foot propped up on a guys crumpled up body that he just beat the **** out of. it may have been justified, but you shouldn't enjoy it.
How would what he's doing be any different than cops posing with a pile of drugs they just seized. If it was taken in OK illegally and he helped with the bust then job well done and he has the right to be proud.
Either way there seems to be a lack of info on the story. I did find where a game warden had killed a nuisance cougar in Cimarron County at the request of a rancher.