India, Sept. 14 -- After the shooting that killed Turning Point USA founder Charlie Kirk at Utah Valley University, questions have surfaced about whether 22-year-old suspect Tyler Robinson had ties to the alt-right or Groyper movement. Robinson is under arrest, and speculation about him has spread online.

Robinson, a Utah resident, was arrested Friday in connection with Kirk's killing. State records reviewed by Reuters show he had no criminal history. He is now charged with aggravated murder. Family members said Robinson had grown more political in recent years and had voiced criticism of Kirk before the incident.

Questions about Robinson's ties to Groypers surfaced online after photos of him spread. In one, he wore a black Adidas track...