jerry mitchell and mary rose have spent years trying to find out. he's written article after article pushing authorities to act. the current coroner re-examined the autopsy and those lost photos of mary horton vail's body. and after 50 years, he ruled it was not accidental drowning. it was homicide. enough for a case. they have felix's old friends. >> he said i fixed that damn [ bleep ]. >> reporter: his own son. >> he said, no, you don't understand, i really did kill her. >> reporter: next, this cold case finally catches fire and the police are closing in. is this the end of the road for felix vail? >> i got this phone call from the sheriff's office. >> i whooped and hollered and danced like i've never danced before. or moms know their kids need love. and encouragement. they also know milk is a nutrient powerhouse. with 8 grams of natural protein, plus 8 other essential nutrients. it's no surprise 9 out of 10 u.s. olympians grew up drinking milk. moms know kids grow strong when they milk life. can anybody help us? (echo) don't go it alone. sfx: din