biologist barrie gilbert is one of the most prominent survivors of a yellowstone bear attack. he lost his eye from it four decades ago. >> a grizzly charged at me, low down, growling terribly, and she caught me and basically tore my face off. >> reporter: wildlife experts with this advice -- what can people do to stay safe? >> the number one thing is don't hike alone, have bear spray with you, know how to use it, make lots of noise, and be aware of your surroundings. >> reporter: there are close to a dozen bear attacks in north america every year. about one at yellowstone national park. the victim, often a person hiking alone. whit? >> important reminders. zohreen, thank you. now to a story of justice delayed but not denied. eric riddick and his family now speaking out. riddick spent nearly three decades behind bars in pennsylvania for a murder he says he did not commit. tonight he's out of prison, but the fight to clear his name is not over. here's abc's zachary kiesch. >> reporter: he served nearly 30 years of a life sentence for a crime he insists he did not commit, but tonight, eric