A Texas man convicted of murdering two people, and paralyzing another, was executed Tuesday, despite evidence he suffered from metal retardation. Milton Mathis, 32, was convicted in 1999 for shootings that killed a 24-year-old, Travis Brown III, and 31-year-old, Daniel Hibbard. The Texas Correctional system discovered that Mathis suffered from mental retardation after IQ tests […]