From the ARRL Letter:

"The FCC has ordered that David Edward Cox, W5OER, of Pride,
Louisiana, be stripped of his Technician class Amateur Radio
license. In October 2005, the FCC sent Cox an Order to Show Cause to
initiate a hearing proceeding to determine if Cox, who's serving
time on several felony convictions, possessed the requisite
character to remain an FCC licensee or should face license
revocation. The FCC says Cox failed to respond to the show-cause
order. A Commission administrative law judge subsequently concluded
that Cox had waived his right to a hearing, terminated the
proceeding and released an Order of Revocation December 4."

Other details on the ARRL website.

FCC has been using its 1990 "Character Order" against amateurs
convicted of felonies and some other violations for several years now.
Basically it comes down to whether a person convicted of a serious
nonradio violation can be trusted to hold an FCC license grant.

73 de Jim, N2EY