>> levi chavez was a -- is a very me-centered person. stresses who arrived in court was katrina garley, a verizon store clerk levi met shortly before tera's death. they began an affair the day they met, and a few weeks later, they were in bed together again in the same home where tera had died. >> when you went to the residence, did you have a sexual encounter? >> yes, i did. >> do you know if the children were there? >> he said they were but, i did not see them. >> reporter: next up, a fellow apd officer, regina sanchez. tera had called her when she learned regina had been sleeping with levi. >> the nature of that phone call was to pretty much get mad at me, ask what was going on. >> was she upset? >> yes, very. >> reporter: and investigators showed that not long after that phone call, someone had typed in a web search on levi's computer, "how to kill somebody." >> after the "how to kill somebody" search, there was a web page that was visited, and that's on how to kill someone. >> reporter: the state's implication? that levi thought murd