anthony klann had sustained a very significant and deep neck wound from ear to ear. that neck wound opened up two large holes in anthony's trachea. >> but at trial state eyewitness eddie espinoza claimed he heard tony klann scream for mercy after his throat had been slit. >> i worked with trachea patients every day. so i knew if you could find the hole in your trachea, you could plug it perhaps, you might be able to make noise. it might sound something like this. so there is no way that anthony klann could be running down a creek bed trying to plug two holes in his trachea so he can scream for his life. >> after visiting the crime scene, father neil had other suspicions about espinoza's testimony. >> joe supposedly grabs the knife and goes after anthony in the creek bed, stabbing him. and yet there were no tire tracks or anything on the side of the creek. and so i thought, whoa, something's not right here. >> neil believed espinoza had to be lying. but a witness who was lying did not necessarily mean joe was telling the truth. neil needed to know more about joe's back