LOCKPORT – A Niagara Falls sex offender pleaded guilty Tuesday to a felony charge of concealing a Facebook account from state authorities.

Joseph M. Higdon, 25, of Niagara Falls Boulevard, admitted to failure to register an Internet identifier, and could be sentenced to as long as four years in prison when he returns before Niagara County Judge Matthew J. Murphy III on May 14.

Assistant District Attorney Cheryl L. Nichols said Higdon used a Facebook account in the assumed name of “Joseph Strickland” on July 3.

Higdon, a Level 1 sex offender, went on the registry in 2006 after pleading guilty to a reduced charge of attempted sexual misconduct for having sex with a 15-year-old girl.