Updated

An Annapolis man is facing federal charges after allegedly threatening to kill U.S. President Barack Obama and his family in an e-mail.

Authorities say Christopher Perkins O'Brien of Annapolis sent an email to the White House on Oct. 16 threatening to behead Obama and cut Michelle Obama's throat. Authorities say O'Brien identified himself in the message as "Mr. C.P. obrien" and listed a Maryland phone number.

Authorities say when they contacted O'Brien, he consented to an interview and ultimately admitted sending the email after denying it several times. Authorities say O'Brien told them that he never intended to carry out the threats and that he is too sick to cause anybody harm.

Authorities said O'Brien expressed regret for sending the message, and felt embarrassed.