PARCHMAN, Miss.— A man who pleaded guilty to killing his estranged wife and sexually assaulting her young daughter as her mother lay dying was put to death Wednesday evening, becoming the first inmate executed in Mississippi in nine years. David Neal Cox, 50, abandoned all appeals and filed court papers calling himself “worthy of death” before the state Supreme Court set his execution date. He appeared calm as he received a lethal injection. A coroner pronounced him dead at 6:12 p.m. CST at the Mississippi State Penitentiary at Parchman. Cox pleaded guilty in 2012 to capital murder for the May 2010 shooting death of his estranged wife, Kim Kirk Cox. He also pleaded guilty to multiple other charges, including sexual assault. A jury handed down the death sentence. Cox wore a red prison jumpsuit and was covered by a white sheet during the execution. Wide leather straps held him down …