Odds are you can't.  Just report it to the authorities:  http://www.ic3.gov/complaint/Default.aspx

You could look at the headers and see what the IP address that was reported
was, but, personally, I wouldn't trust that any more.

There is no way to trace the physical location of the user of an email
address with just the information in the headers of the email. Unless the
sender includes that information in the body of the message (and if this is
a scammer, how much faith should you put in ***ANY*** information in the
body), you really kind locate the sender at all.

You can trace back through the Received headers.  Be careful not to
include any bogus ones that the scammer may have inserted.  That only
traces back to the sending mail host which may be abused by the scammer
or by an infected user host running a mailer trojan.