COLUMBUS, Ohio — An Ohio inmate accused of sending a judge a suspicious letter and powder in an anthrax hoax and instructing a second inmate to do the same has pleaded guilty and had three years added to his sentence.

The Columbus Dispatch ( ) reports 33-year-old Sean Heisa was serving a 30-year prison term for a series of armed robberies when the letters were sent last year containing powder that he claimed was anthrax.

He had three years added to his sentence Monday after he pleaded guilty to charges including possession or use of a hoax weapon of mass destruction, retaliation and inducing panic.

Heisa apologized for, in his words, “wasting the court’s time with these cases,” but he denied telling the other inmate to send the second letter.

Information from: The Columbus Dispatch,

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