ROCKINGHAM, N.H. (CBS) – A former United States Secret Service agent is headed to prison after pleading guilty to sexually assaulting a minor.

Wilbur “Tom” Clark, 70, of East Kingston, N.H. pleaded guilty on Tuesday to two counts of aggravated felonious sexual assault, one count of felonious sexual assault, and one misdemeanor of obscene matter.

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Clark, who was a Secret Service agent for more than 20 years, was accused of assaulting a child under 13 years of age in his home in East Kingston, and on one occasion he allegedly provided the child with obscene pornographic images.

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Following his guilty plea, Clark was sentenced to 20-40 years at the New Hampshire state prison.

He can cut three years off of his sentence if he completes a sex offender program.

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