A former Charleston International Airport employee pleaded guilty to possession of child pornography Wednesday and was sentenced to 10 years in prison and a lifetime of supervised release.

Airport police interviewed Clyde Mitchell, now of Gaston, N.C., in November 2010, after a co-worker found a CD in Mitchell's office containing child pornography, according to prosecutors. Authorities found about 2,000 such images on Mitchell's computer, officials said.

Mitchell, 53, previously was convicted of criminal sexual conduct with a minor and was a registered sex offender at the time of the crime.