LOCKPORT – A Level 1 sex offender pleaded guilty Friday to two felonies and admitted violating the terms of his probation on a third.

Derrick J. Houser, 26, formerly of Niagara Falls, could be sent to state prison for as long as 12 years for his pleas Friday, County Judge Matthew J. Murphy III said.

But Assistant District Attorney Cheryl L. Nichols said Houser still faces two other charges, third-degree criminal sexual act and third-degree sexual abuse, stemming from an incident in Niagara Falls last year. Assistant Public Defender A. Joseph Catalano said Houser refused a plea offer in those matters.

He did plead guilty to two counts of failure to register. Houser left his apartment on Cedar Avenue in the Falls last June and moved to Detroit. He also failed to tell state officials about his Facebook account.

Those offenses constituted a violation of his probation for a 2009 conviction for attempted first-degree sexual abuse.