they'd be back to question tate again. what did you think you had? >> we still had a who done it in our minds? >> but lisa's step mom and sister had no doubts whatsoever. >> i thought it was brian tate. >> reporter: but investigators knew they still had to talk to the husband. when they scheduled an official interview with seth that same day, it didn't sit well with amy. >> is this how you always treat grieving husbands and i started crying? i'm thinking they're being so mean to him. >> we got in an argument because i'm like they have to do that. >> seth techel knew the spouse had to be ruled out. said he was eager to get crossed off the list and instructed his parents no lawyers. >> i remember saying do we need to get a lawyer? >> he was adamant, i didn't do anything. i have nothing to hide. >> i don't need a lawyer.