Honestly, killing Beckett on the first night by the Mafia seems a bit foolish. He's the only one who, if left alone, can sway a random Town member to his side. And his block is more useful than Prikhlop's Night Defense. So, the Mafia's logic at the time is unclear.
ND. (Kill). Kills a player, ignores all types of protection.
Added 1 minute ago
Yeah, that's exactly why, and not because she killed you or your friends who killed Yashur...