shell casing before everything caught up with him. and now he is in his orange prison jacket paying for his crime. it will catch up with you sooner or later. >>> even though hunters wear bright orange vests and hats, accidents still happen. the problem is trying to figure out which shootings are accidents and which are not. in colorado, investigators used forensic metallurgy, a piece of string and geology, to see whether one man's death was an accident or murder. >>> each year thousands of big game hunters flock to the uncompahgre national park in western colorado. >> elk, deer, bear, mountain lion up in that area, so it is kind of a pretty area, very remote. >> on the second day of hunting season in 1995, doug kyle was relaxing in his camp when he heard a woman screaming. she said she found her husband lying on the ground near their camp. he had been shot in the chest. >> go ahead, sir. >> a man has been shot and killed up here. >> today? >> yes. his wife is here. she's going crazy. >> i could tell that, you know, he was deceased and i looked at her and i told her, ma'am, i'm sorry, but he's gone. >> the victim was 48-year-old bruce dodson. his wife janice said