The man accused of killing conservative commentator Charlie Kirk got the gun authorities say he used in the fatal Utah Valley University shooting from his grandfather, according to charging documents filed Tuesday.

The suspect also described the messages he allegedly engraved into bullet casings that authorities later recovered from the scene as “mostly a big meme.”

Prosecutors held a news conference Tuesday after formally filing charges against Tyler James Robinson, 22, in connection with Kirk’s killing. Utah County Attorney Jeff Gray, who is leading the prosecution, said they intend to seek the death penalty.

According to a probable cause statement filed after Robinson was first arrested early Friday, the gun used in the shooting was a Mauser Model 98, .30-06 caliber bolt-action rif

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