If some one with a yahoo account is threatening me with bodily harm what can I do?

Report the user for stalking/haring to: y_answrs_team@yahoo.com (the missing e is intentional). Include a link to his profile if possible. If the threatening happened here on YA, include a link to the page with the offending post, if the threat was in a mail, attach that mail to the one you send to the team. Here's how to go about attaching a threatening mail: click the crtl key and at the same time click the "forward" on to forward a message as an attachment, mac users should click the "apple" key and click "forward" simultaneously.