The man who allegedly killed Charlie Kirk engraved the bullets he used in front of his trans partner at the home they shared, according to police.Tyler Robinson, 22, confessed to his live-in partner Lance Twiggs, 22, after shooting the conservative commentator dead at Utah Valley University last week, officials said on Tuesday.In text messages between the couple after Kirk's assassination, Robinson allegedly wrote: 'Remember how I was engraving bullets?''The f***** messages are mostly a big meme, if I see "notices bulges" on Fox News I might have a stroke.'Twiggs apparently never went to law enforcement after receiving the texts. Robinson remained on the run for more than a day until his parents recognized him in a photo released by authorities.However police have emphasized Twiggs is not accused of any wrongdoing and has been fully cooperative with detectives.Officials did not say whether Robinson had told Twiggs about his dislike for Kirk and his political views. They revealed they are looking at whether others knew about Robinson’s plans or helped. But have not said if his partner is among those being investigated and have expressed appreciation for Twiggs sharing information. Robinson had been in a relationship with his transgender roommate, Lance Twiggs Tyler Robinson, 22, joked with his friends that he resembled the man wanted by police for the assassination of Charlie Kirk The 31-year-old conservative activist was debating with students at Utah Valley University on Wednesday when he was shot in the neckIn their text exchange, Twiggs appeared shocked after Robinson confessed, and asked him why he had done it.Robinson allegedly replied that he had 'had enough of [Kirk's] hatred' and that 'some hate can't be negotiated out.'The alleged killer and Twiggs had reportedly been living together for at least a year. Robinson allegedly told Twiggs that he had been planning the killing for about a week. 'Delete this exchange,' the alleged killer then told the roommate, according to authorities. 'Don't talk to the media please or make any comments, if any police asks questions just ask for a lawyer and stay silent,' Robinson allegedly instructed Twiggs.Officials also charged Robinson with obstruction of justice and witness tampering, citing the messages. Robinson’s mother told investigators that their son had turned hard left politically in the last year and became more supportive of gay and transgender rights, Gray said. Robinson is also alleged to have referenced engraving bullets, investigators said they uncovered unspent rounds with anti-fascist and pro-trans ideologies inscribed on them