she did manipulate him. did she manipulate him to the point of killing sam? i don't know. >> reporter: detectives mcdonald and szalbirak realized they needed to pay danielle dreher another visit. >> we're going back to find out what is your intent, what is your involvement in this? >> coming up, did someone have reasons to commit murder? >> it was a substantial amount of money she was going to gain. >> when "dateline" continues. ♪ and add elegance to your home. but quilted northern is not a robe. it's just really nice toilet paper. emreplenished,d, fortified. emerge everyday with emergen-c. packed with b vitamins, electrolytes, antioxidants, plus more vitamin c than 10 oranges. why not feel this good every day? emerge and see.