tina montelongo: it didn't.hy's memory. josh mankiewicz: did she leave the mark on the world that she always wanted to leave? tina mora: yes, she did. we have letters-- of coworkers, of students she worked with. josh mankiewicz: people you didn't even know. tina mora: people we didn't even know that we're able to come back and tell my mom, or tell one of us, you know-- we miss her at savon. she was always smiling. she'd always help us. so what they did to her, all those stab wounds that she got, multiply those, and those are her marks. narrator: for 21 years, sam denied he inflicted those stab wounds, denied he killed cathy. but at his sentencing, sam did something unexpected. sam lopez: i would like to apologize to the torrez family and to everyone for all of the harm and the grief that i have caused them. this was a horrible act that never should have happened. it is entirely my fault. i take full responsibility. narrator: sam lopez was sentenced to 26 years to life in prison. xavier pleaded guilty to involunt