we do not know, say the defense, but it was not rick gagnon. ck weighted with his attorneys, and the woman many felt to be at the heart of it all held her breath. >> coming up, the jury renders its verdict. >> i did not know what to think anymore. >> but it is not the end of the case, because finally, investigators learned who have those mystery blood drops at the crime scene. >> they said they identified the killer. >> when "dateline" continues. n "dateline" continues nexgard is the flea and tick protection that's #1 with vets. it even prevents the infection that causes lyme disease. your vet trusts nexgard for her patients and her own dog. plus, its delicious beef flavor is #1 with dogs. ask your vet about nexgard. what can i du with less asthma? with dupixent, i can du more....beginners' yoga. plus, its delicious beef flavor is #1 with dogs. namaste... ...surprise parties. aww, you guys. dupixent helps prevent asthma attacks... ...for 3!... ...so i can du more of the things i love. dupixent is not for sudden breathing problems. it's an add-on