Johnson in March was ordered to stand trial on 70 counts of corruption of minors, indecent assault and related counts after two boys testified about sexual contact with Johnson at Seneca Valley High School. One boys says Johnson threatened to "take out" the boy's family if he told anyone.
The boy in the lawsuit is not named but says he is one of those involved in the criminal case.
Johnson has pleaded not guilty to the criminal charges.
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Information from: Pittsburgh Tribune-Review, http://pghtrib.com