dimitry ruvin: and that's when i asked her about owning any guns. t, ruvin searched katrina's apartment but did not find a gun. he seized her phone and computer but cops didn't find anything incriminating. josh mankiewicz: there was no gun registered to her anywhere. no. and no sign that she'd ever owned one at any point in her life. that's correct. josh mankiewicz: ruvin kept going. i subpoenaed her bank records and credit card records just to see if she purchased any ammunition somewhere. you didn't find it. no. josh mankiewicz: ruvin didn't stop there. he kept looking everywhere. he even went all the way to katrina's hometown in mississippi where he learned something interesting. i talked to her dad who said that he had guns, multiple guns in the house, and that katrina had shot guns before. so we knew she lied. josh mankiewicz: but that is no criminal offense. still, ruvin was certain he could eventually find something concrete and he kept looking. weeks passed, then months. i think that's probably the toughest thing about this job is if it goes