Court records show a former government scientist accused of attempted espionage last week pleaded guilty earlier this year to overbilling NASA and the Department of Defense more than $265,000 for contracting work.

The January plea by 52-year-old Stewart Nozette of Chevy Chase, Md., was detailed in court records unsealed Friday. The records state the documents were sealed because Nozette was cooperating in unrelated government corruption investigations.

Nozette was arrested last week and accused of selling sensitive government secrets to an FBI agent posing as an Israeli intelligence operative.

The unsealed court documents say Nozette pleaded guilty in January to overbilling the government between 2000 and 2006 and spending the money on personal bills and maintaining his swimming pool.