The neighbor who called to request a welfare check on Atatiana Jefferson before she was shot by a cop in her own home says he feels 'partly responsible' for her death. 

'If I had never dialed the police department, she'd still be alive,' James Smith, 62, told the Fort Worth Star-Telegram. 'I'm shaken. I'm mad. I'm upset. And I feel it's partly my fault.' 

Atatiana Koquice Jefferson, 28, of Fort Worth, Texas, was killed by an unidentified white police officer who failed to identify himself as a cop when he entered her home Saturday morning after Smith called the local non-emergency number when he noticed her front door was open and lights were on around 2.25am.

Fifteen minutes after authorities arrived to the scene, Smith heard a gunshot and watched several officers rush Jefferson's home.