away in the philippines. >> until, well over a decade later, dennis got that called from reporter larry altmanheard she even had another husband. >> yeah. >> did he tell you how he died? >> he told me just how he got shot in the head, too. >> just like your brother? >> yeah. yeah. >> did you immediately think, oh, boy, she's done it again? >> yeah. i did. >> maybe now, hoped dennis, all the renewed interest in sonia might finally reignite the investigation into his brother's case. >> i thought, sonia was going to be hung from the highest tree and serve a lifetime behind bars. >> understandable, if naive. coming up -- >> had she been arrested, larry risken would be alive today. >> you looked into her past? >> oh yes, very sensibly. >> what other secrets might sonia be hiding? when "dateline" continues. feeling better? on top of the worlddddd!!! before advil. advil targets pain at the source of inflammation. when pain comes for you, come back fast with advil liqui-gels. active psoriatic arthritis can slow me down. now, skyrizi helps me get going. along with clearer skin, skyrizi helps with less