Robert Dale Rowell, 50, was executed just after 6 p.m. Tuesday in Huntsville for killing two people at a crack house in Houston 12 years ago. Rowell had already served a sentence and had allegedly killed a fellow inmate before the bloody rampage in 1993 in which Raymond Mata, 38 and Irvin Wright, 52, were killed. The U.S. Supreme Court refused to review Rowell’s case last month. Rowell was the 18th inmate executed this year in Texas and the first of two scheduled to die this week. Condemned inmate Shannon Thomas is scheduled to die Wednesday evening for a triple...