Palmer, who runs a dental practice in Minnesota and hunts big game in his spare time, is accused of illegally killing Cecil, a protected lion, in Zimbabwe on a $50,000 (£32,000) hunt.
After uproar over the incident, Palmer apologised for killing the Zimbabwe's most favourite lion, The Daily Mail reported.
His apology seems not enough for his cruelty. After his apology his image transformed from a dentist and longtime hunting enthusiast to a villain at the center of a firestorm over the ethics of big-game trophy hunting.
Palmer likes to have the severed heads and limbs of the world's finest animals.
The bigger the beast the better: lions, tigers, rhinos, bison, elks, anything that looks great in his snuff trophy cabinet.
Dr Palmer tours the jungles, prairies and safari parks of the world hunting his prey.
If convicted, Dr Palmer can be sentence in prison, but captivity seems way too good for him.
"Instead, I'd like to introduce a new sport - Big Human Hunting," writes Peirs Morgan.
"I will sell tickets for $50,000 to anyone who wants to come with me and track down fat, greedy, selfish, murderous businessmen like Dr Palmer in their natural habit," added Morgan.
"We'd lure him out with bait - in his case I suggest the fresh blood of one of his victims would be very effective as it seems to turn him on so much - and once lured, we would all take a bow and fire a few arrows into his limbs to render him incapable of movement."
Then we'd calmly walk over, skin him alive, cut his head from his neck, and took a bunch of photos of us all grinning inanely at his quivering flesh.
This may sound harsh, but if you ask Dr Palmer, it's really not.