Ruben Gutierrez, a 47-year-old Texas inmate, is scheduled to be executed by lethal injection on Tuesday evening at the state penitentiary in Huntsville for the 1998 murder of 85-year-old Escolastica Harrison. Gutierrez was convicted of fatally stabbing Harrison, a mobile home park manager and retired teacher, in her Brownsville home. Prosecutors argued that Gutierrez killed Harrison in an attempt to steal money she had hidden in her residence. Despite maintaining his innocence throughout his legal battles, Gutierrez has exhausted all appeals. His claims of not being involved in Harrison’s deat…