Suspect Tyler Robinson, 22, in custody for Charlie Kirk shooting

Sept. 12 (UPI) -- Police have the man they believe is responsible for the shooting death Wednesday of political activist Charlie Kirk in custody.

The suspect accused of killing Charlie Kirk is Tyler Robinson, Utah Gov. Spencer Cox said in a press conference.

A family member saw the photos and turned him in to the police, Cox said.

Robinson is 22 and from Washington, Utah, which is in the far southwest corner of the state. He was not a student of Utah Valley University, where the shooting took place.

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He was arrested on charges of aggravated murder, felony discharge of a firearm causing serious bodily injury and obstruction of justice, according to a probable cause affidavit, NBC reported.

Robinson is in the Utah County Jail.

The governor said law enforcement doesn't anticipate any other arrests, but the investigation is ongoing.

Police were able to find Robinson because Robinson reached out to a family friend who contacted the Washington County Sheriff's Office with information that Robinson had confessed to them or implied that he had committed the shooting, Cox said.

A family member of Robinson told investigators that Robinson had become more political in recent years, Cox said in the press conference. The family member referenced dinner before the shooting, and in the conversation with another family member, Robinson mentioned Charlie Kirk was coming to UVU. They talked about why they didn't like him. They said Robinson said Kirk was full of hate and spreading hate. They also confirmed Robinson had a gray Dodge Challenger, which is the car police saw on surveillance video at the university.

A roommate of Robinson showed investigators messages Robinson had posted on the messaging app, Discord, referring to watching an area where a rifle was left wrapped in a towel. It also referenced bullet engravings.

The gun police found was a .30 caliber, bolt-action rifle with a scope, wrapped in a towel, Cox said. One of the engravings on the bullet cartridge said, "Hey fascist, catch." Another said, "If you read this, you are gay, LMAO."

FBI Director Kash Patel said, "This is what happens when you let good cops be cops."

He thanked the president and law enforcement for their work, then said, "Lastly, to my friend, Charlie Kirk, rest now, brother, we have the watch, and I'll see you in Valhalla."

Earlier Friday, President Donald Trump told Fox News that he thinks "with a high degree of certainty" that the shooting suspect was in custody. "I think we have him," the president said.

The press conference with the latest information on the case was scheduled to begin at 9 a.m. but began around 10 a.m.

Cox said people should avoid watching gruesome videos of the shooting and other attacks on social media because, "We are not wired as human beings, biologically, historically, we have not evolved in a way that we are capable of processing those types of violent imagery."

"I would encourage people to log off, turn off, touch grass, hug a family member, go out and do good in your community," Cox said.