(CNN) — As investigators pore through online messages, notes, and engraved shell casings in their search for a motive in the killing of one of the country’s most prominent conservative activists at a Utah Valley University campus event , authorities are also looking into whether suspect Tyler Robinson’s romantic relationship with a transitioning roommate was a factor in the shooting, Utah Gov. Spencer Cox told CNN’s Dana Bash Sunday morning.

Meanwhile, the 63,400-seat State Farm Stadium in Glendale, Arizona, is preparing to host a massive memorial on September 21, which is expected to be a testament to Charlie Kirk’s influence. His wife, Erika Kirk, pledged on Friday to continue his work, including his campus tours and podcast.

Mourners across the country are attending vigils to

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