Matthew Casey

The Republic | azcentral.com

Grand Canyon authorities say they%27ve hit a dead end in the alleged squirrel-kicker case

A viral video from August appeared to show a half-dressed man kicking a squirrel off the canyon

PETA has offered a %2415%2C000 reward and a Grand Canyon vacation for information leading to an arrest and conviction

A federal investigator said he's at an impasse in the hunt for a half-dressed man who appeared to kick a squirrel over the side of the Grand Canyon in a video that went viral last month.

Grand Canyon Chief Ranger Bill Wright said Monday that the case will remain open, but none of the tips provided by the public have led to the alleged squirrel-kicker.

People for the Ethical Treatment of Animals (PETA) announced last week that it is adding a vacation to the Grand Canyon to the $15,000 reward it offered last month for information leading to the arrest and conviction of the man.

There are different versions of the video that was uploaded to YouTube and posted to the Daily Mail's website.

YouTube had removed the clip Republic Media linked to in its original story last month because it violated the company's term's of service. But clips of news coverage of the incident are still available via search.

The video shows two shirtless men standing on a cliff.

One scene shows a man shooting video while another man dressed in black shorts lays a trail of food to the edge.

Another scene shows the man in black shorts putting on his shoe. A squirrel follows the trail of food to the edge.

In another scene, the man in black shorts appears to kick the squirrel over the edge.

PETA wants anyone with information to contact Wright at 928-638-7888.

The Associated Press contributed to this article.