The Pima County Sheriff's Office released an estimated 2,700 pages of investigative records Wednesday from a shooting rampage here two years ago — documents that are expected to shed new light on a massacre that left six dead and 14 wounded. Jared Loughner, now 24, pleaded guilty last year to the Jan. 8, 2011, outburst that critically wounded then-U.S. Rep. Gabrielle Giffords, D-Ariz., and killed U.S. District Judge John Roll. Loughner is serving multiple life prison sentences.