stabbing was self-defense. fox news legal analyst mercedes colwin on this today. >> what a cautionary tale. the italian judicial system is different from us. no jury, judge making the decision. already the judge is indicating that she is a little suspicious of the self-defense that they're claiming that took place and that resulted in the stabbing of the police officer. she said it is lack of self-control. so already she's suspicious of self-defense. that's their core defense. coming forward and saying that police officer didn't identify himself. we thought we were going to be robbery victims and we defended ourselves and what resulted in the death of the officers. >> the father said he cannot come to terms with it. deeply upset while convinced of his innocence. >> any parent would.