Michigan software publisher Michael Skupin has been attacked with pepper spray, reportedly by an animal rights activist.
The attack happened in Columbia, Mo., Tuesday as Skupin took part in a program on workplace safety.
Authorities say an activist reportedly doused him in the face with pepper spray. Police arrested a man at the scene but nobody has been charged.
Several other people were hit with the spray, including some children. All were treated at the scene.
Skupin says the man gave him a letter indicating he was acting alone.
The former Survivor player says the animal rights group People for the Ethical Treatment of Animals has voiced concern before about an episode in which Skupin killed a pig. But he says PETA has backed down, after he discussed the incident with them.
Skupin left the CBS reality show after suffering burns in the Australian Outback.
Earlier this week, Skupin was introduced at a Republican fund-raiser as a potential U.S. Senate candidate.
State GOP leaders say there has been talk about the 39-year-old Skupin challenging Democrat Carl Levin. Skupin says he'll make up his mind after talking with political leaders in Lansing next week.