Cecil was reportedly killed by American hunter Walter Palmer, a dentist from Minnesota. Palmer is said to have paid $50,000 for a chance to kill the lion.
Palmer is accused, along with two guides, of enticing the lion out of a national park before shooting it with an arrow. The animal died two days later, after the hunters tracked him down and shot him with a gun. His head was cut off and used as a trophy for Palmer.
"As a responsible hunter it is your job to know what you're hunting...you can't just hunt anything you want," said Bobbi Brink, owner and operator of Lions, Tigers and Bears.
Palmer issued a statement saying he didn't know the history behind the lion, which was considered the symbol of Zimbabwe and was part of a study to see why the number of lions is declining.
Brink urges people to notify the U.S. Department of Fish and Wildlife to make it illegal to import lion heads as trophies.