A violence-prone ex-con wrapping up a federal sentence for weapons possession is going back to prison after pleading guilty to the same charge.

U.S. District Judge Stefan R. Underhill sentenced Albert Lopez, 43, of Derby to six more years in federal prison from his guilty plea to being a felon in possession of a firearm in April 2011 and violating the terms of his supervised release from a 2008 federal conviction on the same charge.

The most recent arrest came when a State Police trooper stopped Lopez for driving erratically on Interstate-91 in Enfield on April 2, 2011, and seized a loaded 9mm pistol from his waistband.

After being released on bond, Lopez failed to show up for his state court hearing. He was arrested again on April 15 by the U.S. Marshals Violent Fugitive Task Force for failure to appear.

He has been detained without bond since then.

Lopez has prior convictions in Pennsylvania and Connecticut for second-degree assault with a firearm; carrying a pistol without a permit; conspiracy to distribute cocaine; possession of contraband by an inmate and possession of a firearm by a convicted felon.

That last charge resulted in a 47-month federal prison term followed by three years of supervision by the U.S. Probation Department. He was still being supervised at the time of his latest arrest.

Assistant U.S. Attorneys Jonathan Freimann and Ndidi Moses prosecuted the most recent case.