likely or sometimes a lot more likely to get a disease, but not necessarily for sure. >> reporter: robin carlin says for her the risks were clear. up to 65% of women with a mutation like hers will get breast cancer, and 39% will get ovarian cancer by the time they're 70. robin made the difficult decision to have a double mastectomy and remove her ovaries and fallopian tubes, all because her son took that genetic test. >> i think perhaps he felt guilty because i went through so much. and i kept telling him over and over again, you know, don't feel guilty because you've really potentially saved my life. i am incredibly thankful to my son. >> reporter: kate snow, nbc news, pittsburgh. >>> up next, new clues in that shocking murder mystery in washington. there's word tonight of a secret big money delivery. >>> we're back now with the new information in the murder mystery just blocks from the vice president's home in washington. a family held hostage, then found dead inside their burning mansion. we're learning about a secret money delivery before they were killed. our national correspondent, peter

likely or sometime a lot more likely to get a disease, but not necessarily for sure. >> reporter: robin carlinfor her the risks were clear. up to 65% of women with a mutation like hers will get breast cancer, and 39% will get o varn cancer by the time they're 70. robin made the difficult decision to have a double mass taken tommy and remove her ovaries and fallopian tubes all because her son took that genetic test. >> i think perhaps he felt guilty because i went through so much. and i kept telling him over and over again, you know don't feel guilty because you've really potentially saved my life. i am incredibly thankful to my son. >> reporter: kate snow, nbc news, pittsburgh. >>> up next new clues in that shocking murder mystery in washington. there's word tonight of a secret big money delivery. of a secret big money ♪ roundup ♪ ♪ i'm a loving husband and a real good dad ♪ ♪ but weeds just make me rattlesnake mad ♪ ♪ well roundup has a sharp-shootin' wand ♪ ♪ i'm sendin' them weeds to the great beyond ♪ ♪ roundup ♪ yeha! [ whip cracks ] ♪ ♪ ♪ no need to pump, just point and shoot ♪ ♪ hit 'em

. >> reporter: robin carlin never thought she had to worry about her dna. >> i thought his great geneseporter: she was active healthy, had no known family history of cancer. five years ago, her tech-savvy 22-year-old son, eli, got the results of a consumer dna test he'd ordered on line. they were shocked to learn eli had an abnormality usually associated with women -- a brca 1 mutation which dramatically increases the risk of breast and ovarian cancers. robin got tested and learned she had the mutation, too. her family history had been hidden. she got the mutation from her father and had passed it on to her son. would your insurance company have covered the test if your son hadn't all right taken one? >> no. they would not. there are strict criteria for what family history qualifies you. i did not have that family history. >> reporter: robin isn't alone. half of the women with brca mutations would not meet insurance criteria. >> if we only offer testing to women who have a family history, we'll miss half of the women with mutations. >> reporter: dr. mary claire king thinks every woman