his name was brad holzer. >> he would know where she was. >> brad lived with his soon-to-be ex-wife lesshan five minutes from susie's apartment. val drove over, knocked on the door. >> i said, susie's not home, we can't find her, she's not answering her calls and we're all really worried. and then i remember exactly what he said to me. he said, what do you mean she isn't home? i dropped her off at 5:00 a.m. that's when it hit that we're going to the police, something's not right. >> it certainly wasn't. the man whose marriage was breaking up, the last man to be with her didn't know a thing? really? >>> coming up, susie's new boyfriend fields a few questions down at the station. >> did you guys make out or anything before she exited the truck? >> yeah. >> did you ever wonder about brad and whether he was capable of any bad thing? >> when she went missing, i wondered about everybody. everybody was a suspect. >> when "dateline" continues. t. >> when "dateline" continues every minute. understanding how to talk to your doctor about treatment options is key. today, we are redefining how we do