From the Verge:
It seems the tough streets of Philadelphia were too much for a friendly little robot from Ontario. All the Hitchbot wanted to do was see the United States. But just two weeks after starting its cross-country journey in Boston, Hitchbot’s trip has come to an unfortunate end. Last night, the cute little robot was vandalized and apparently decapitated in the City of Brotherly Love.
This is kind of old news, but I just saw this particular article, and the video shows the robot in Niagara Falls