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From the link:
Updated: 9:17 PM CDT May 23, 2022
FORT HOOD, Texas — A document from the Texas Department of Public Safety that was filed in federal court reveals the motive behind why
Fort Hood Spc. Vanessa Guillen was murdered in 2020 by fellow soldier Spc. Aaron Robinson.
The document, filed on May 19 this year, describes an interview with Cecily Aguilar, the only person charged in Guillen's murder. At one point, authorities asked Aguilar why her boyfriend, Robinson, would want to kill Guillen. She told authorities he did it because Guillen saw a photo of Aguilar on Robinson's phone, the document states.
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Aguilar's 'confession'
Prior to revealing the motive behind Guillen's murder, Aguilar spoke to authorities multiple times during the search, according to the document. Throughout, she claimed she was at home the night Guillen disappeared and that Robinson was with her, the document states. However, the day Guillen's body was found, Aguilar told authorities a different story, according to the document.
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"I asked Aguilar to start the story over and tell the truth this time. She then asked if I would like her to write it down or tell it to me, to which I told her to tell me what happened," the detective says in the document.
Aguilar told authorities "Robinson killed the girl," the document states. She proceeded to tell authorities how Robinson took her out to the Leon River and "showed me her," the document adds.
She also claimed she didn't know Robinson was taking her to the Leon River and that he held a gun to her head to help him dispose of Guillen's body while there, the document states. Authorities said she was lying about that detail, per the document:
"Aguilar further explained she bought two bags for $10 after querying 'concrete for sale' on Facebook marketplace. She got the idea to buy the concrete that way from watching the show CSI/Criminal Minds and believed she would not leave a 'paper trail.' ... During the conversation about the concrete, Aguilar said they used the concrete both nights. I realized this contradicted her claim of not knowing why she was going to the Leon River the first night and asked her to clarify. Aguilar then said they only used the concrete on the second night. I later learned Aguilar bought the concrete the first night, prior to even going to the Leon River, thus she lied about Robinson forcing her at gunpoint while at the location."
Aguilar told authorities she then removed Guillen's body from the government-owned tote Robinson carried her in because "Robinson didn't want to," the document states. She told them how she then dismembered Guillen's body and burned her remains, along with Guillen's clothes and the government tote, per the documents.
She told authorities they returned to the location a second night to finish dismembering Guillen's body, as well as burying her bones in the ground and covering it with concrete, the document states.
"Aguilar and Robinson placed the bones in three or four holes and thought they would not be discovered for a couple of years," the document states.
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Robinson escapes military custody, kills self
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While Aguilar was with authorities, she was asked "to get Robinson to see if he will talk about the murder by telling him that she was scared and wanted to turn herself in," the document adds.
"Robinson eventually began to admit culpability after Aguilar asked, 'What are we going to do if we get caught?' Robinson replied, 'I don't know,' Aguilar then said, 'I'm going to tell them the truth. I can't keep doing this,' to which he said, 'okay.' Robinson went on to say he was in a conference room and he did not want Aguilar to abandon him," the document states.
Around 10:10 p.m. on June 30, 2020, authorities were notified that Robinson managed to elude authorities and get off post, the document states.