we have this sperm in bonnie craig. accident, said the prosecution. it was rape and murder. this man was about to suggest, maybe bonnie craig had a few secrets of her own. >> it was consensual sex. how many people had a different side to them that was different than what family and friends knew? >>> coming up -- the case for the defense. >> you're saying this young woman -- >> i'm saying that's a definite possibility. >> would the jury buy it? >> we the jury find the defendant -- >>> and coming up next friday on "dateline," they were swimming in cash, a husband and wife team trading gold, making millions. till it ended in murder. >> somebody had an absolute mission to kill her. >> was money the motive? or maybe their troubled marriage. >> i could hear them bickering about the business. >> a baffling crime. >> i said, what the hell is going on? >> and a heart stopping mystery. >> i want to know why. [ male announcer ] where's your road to happiness? what if the first step on that road is a bowl of soup? delicious campbel

the autumn of 1994 in anchorage, alaska a suffocating grief settled on the home of 18-year-old bonnie craigily that a hiker found her body floating in the creek. >> we were all devastated. >> it was really tough. >> reporter: the trooper said bonnie had fallen off a cliff. it was an accident. her mother didn't believe it. >> none of it made sense. she didn't drive so how did she get out there? she would not have missed school. >> reporter: others suspected foul play. >> we have blood up here. >> we did find one drop of blood on a leaf at the top of the cliff. it was a drop. #. >> they couldn't find a weapon or eyewitness but the troopers did find something else -- dna evidence. bonnie had been raped. so they collected dna from every man who had come in contact with her hoping to find a match. no avail. her mother took the case public. >> somebody knows what happened and we need to hear from them. >> the case grew cold and incredibly 12 years after the murder a dna match from a national data base with a man serving time for armed robbery in new hampshire, 4500 miles away. >> you would expect

bonnie ray volunteers for the romney camp in south florida. >> they want to know who will turn the country around and that is what most of us have heard from the seniors. >> reporter: mike and jerry craigtheir 70s and both gingrich supporters and both troubled by governor romney's massachusetts health program. >> gingrich will protect medicare and because of the massachusetts experience from romney he represents a threat to medicare. >> mitt romney would never, ever do anything that would be detrimental for seniors. >> reporter: in a survey 43% are concerned about the health care and others about the economy. the tough economy is making living herein ceasingly difficult. >> this month, everything that i have bought that goes up, nothing has stayed the same. >> it's going to be pivotal to win the senior vote. >> reporter: in the last republican primary in the state, 2008, a third of all votes cast in that primary came from voters squae sixty-five years or older. the most powerful voting block. >> a lot of them have voted already, voting early. thanks kerry sanders and what political story will be making headlines in the headlines in t4 hours? i think it's florida. that's next on "andrea

bonny rey volunteers for the romney campaign in south florida. >> they want to know, who is going to turn our country around and that's what most have heard from the seniors. >> reporter: mike and jerry craigovernor romney's massachusetts health program. >> gingrich is the one that will present medicare and because of the massachusetts experience from romney, he represents a threat to medicare. >> mitt romney would never, ever do anything that would be detrimental to seniors. >> reporter: in an aarp survey of florida residents, 43% say health care costs are a big worry. 31% of seniors are concerned about the economy. warm weather lured many into retiring in florida, but for some, the tough economy is making living here increasingly difficult. >> about everything i buy that has gone up, nothing has stayed the same. >> reporter: political analyst kevin wagner. >> it's going to be pivotal to win the senior vote. the person wins the senior vote on the republican side will be in the driver's seat to winning this election. >> reporter: how powerful is that vote? two years ago the senior vote was the deciding factor in six narrow congressional races here in florida. all six of those seats went to