Article continues below advertisementCharlie Kirk's suspected killer, Tyler Robinson, had an "obsession" with the right-wing influencer, the FBI revealed in a new report. Robinson, 22, is accused of fatally shooting Kirk at Utah Valley University on September 10. The 22-year-old is believed to have exhibited "multiple warning signs" before the shooting, according to FBI Co-Deputy Director Dan Bongino.Article continues below advertisementTyler Robinson Was 'Obsessed' With Charlie KirkSource: MEGAAuthorities reported that Tyler Robinson was 'detached' from politics.