Amanda Knox, convicted of murdering her British roommate Meredith Kercher, has nightmares and traumatic memories of her four years in Italian courts and prison. But she has only warm memories of Kercher and says she would like to visit her grave one day.

Knox talked about Kercher as well as her legal ordeal in an exclusive interview with ABC's Diane Sawyer. Her recall of those years has moments of regret, anger and sadness. Also among her emotions are warm thoughts of Kercher and empathy for her family.

'I want them to know,' Knox said, getting emotional, 'their grief has my every respect, has the respect of my family, and we just don't want to... we don't want to invade their life and their grief.'

Watch Amanda Knox in an exclusive interview with Diane Sawyer set to air Tuesday at 10 p.m. ET.

'And I really want them to understand that my need for justice for myself is not in contradiction with theirs,' she said.

Knox recalled her short time, a mere six weeks, with Kercher, who was also studying in Perugia.

'She talked about how she wanted to be a journalist like her dad. And she talked about her sister. And if that's all I can give them is this memory that I have of her to add to... all of theirs that they can carry with them when she's gone.'

FULL COVERAGE: The Amanda Knox Case

Knox paused at.