rayed ▁by ▁a ▁former ▁al ly . ▁Pe ña ' s ▁sister ▁claims ▁that ▁his ▁murder er ▁was ▁sus pected ▁G ulf ▁Cart el ▁regional ▁leader ▁known ▁as ▁Edu ardo ▁L una , ▁who ▁shot ▁Pe ña ▁from ▁behind ▁because ▁he ▁was ▁guard ing ▁US $ 2   mill ion ▁in ▁c ash ▁for ▁the ▁G ulf ▁Cart el . ▁ ▁She ▁claimed ▁that ▁after ▁he ▁killed ▁Pe ña , ▁L una ▁fled ▁to ▁the ▁U . S ., ▁where ▁he ▁was ▁later ▁arrested ▁for ▁another ▁murder ▁and ▁cor ruption ▁case ▁involving ▁the ▁United ▁States ▁Border ▁Pat rol . ▁Pe ña ' s ▁sister ▁also ▁claims ▁that ▁she ▁had ▁met ▁L una ▁in ▁Mexico , ▁and ▁that ▁he ▁killed ▁several ▁others ▁before ▁her ▁brother . ▁She ▁said ▁his ▁alias ▁in ▁the ▁G ulf ▁Cart el ▁was ▁" Com and ante ▁P á jar o " ▁( English : ▁" Comm ander ▁Bird "). ▁Her ▁claims ▁were ▁not ▁independently ▁verified ▁by ▁law ▁enfor cement , ▁and ▁she ▁later ▁decl ined ▁an ▁interview ▁with ▁The ▁Texas ▁Trib une . ▁L una ' s ▁defense ▁did ▁not ▁comment ▁on ▁Pe ña ' s ▁case . ▁ ▁See ▁also ▁Mexican ▁D rug ▁War ▁ ▁S ources ▁ ▁Foot notes ▁ ▁References ▁ ▁Bibli ography ▁ ▁External ▁links ▁ ▁Mario ▁" Pop o " ▁Pe ña ' s ▁T ribute ▁Page ▁on ▁Facebook ▁ ▁Rap ▁Song ▁of ▁Mario ▁" Pop o " ▁Pe ña ▁by ▁Li rik ▁Dog ▁on ▁YouTube ▁▁ ▁Rap ▁Song ▁of ▁Mario ▁" Pop o