it was very shocking that somebody i know. very heart breaking. i never thought it could happen in any town, or especially someone that i know at all. reporter: despite the social media posts, an uncle who lived with the suspect told cnn his nephew was not violent. the warning signs, i saw him yesterday evening, and i went home, and i said, i went down stairs and said bye. that was it. that was it. i see no, nothing that could trigger him doing that. the weapon, do you have any idea where i m not sharing that, no. reporter: despite what this uncle say, we now know the warning signs, the suicide attempt, threatening his family, the confiscation of the knife collection. despite that, he was able to purchase handguns and rifles legally. including the rifle he used to slaughter seven people. laura. thank you so much. it s heart wrenching to hear this. i want to bring in david axelrod. david, supermarkets, hospitals, a fourth of july parade. seems there is no place y
he was very quiet. he didn t talk that much, and when he did talk, he seemed very gentle. he didn t seem like aggressive or anything at all. it was very shocking that somebody i know. very heart breaking. i never thought it could happen in any town, or especially someone that i know at all. reporter: despite the social media posts, an uncle who lived with the suspect told cnn his nephew was not violent. the warning signs, i saw him yesterday evening, and i went home, and i said, i went down stairs and said bye. that was it. that was it. i see no, nothing that could trigger him doing that. the weapon, do you have any idea where i m not sharing that, no. reporter: despite what this uncle say, we now know the warning signs, the suicide attempt, threatening his family, the confiscation of the knife collection. and disturbing social media posts online. despite that, he was able to purchase handguns and rifles legally. including the rifle he used to slaughter seven pe