article_snippet.sent: A fourth victim, understood to have been a witness, had no visible injuries and is thought to have died of a heart attack.
article_snippet.sent: Several other people suffered serious injuries in the attack, including Giardiello's former colleagues and accountant.
article_snippet.sent: Several others suffered serious injuries in the attack, including Giardiello's ex-colleagues and accountant .
article_snippet.sent: Four people are thought to have died .