Following the horrific assassination of conservative activist Charlie Kirk, Matt Gutman reports on the arrest of 22-year-old suspect Tyler Robinson, Pierre Thomas has details on what we're learning about the suspect and Jon Karl has more on Utah Gov. Spencer Cox's stark warning about political violence; David Muir shares the story of a father and son in Costa Mesa, California, who inspired millions with their simple morning routine; and more on tonight's broadcast of World News Tonight with David Muir.

Chilling new developments in the assassination of Charlie Kirk, Matt Gutman reports on law enforcement sources saying accused assassin Tyler Robinson allegedly tracked Kirk's schedule for days, and the new details from the FBI about DNA evidence allegedly linking Robinson to the murder; Pierre Thomas one-on-one with Attorney General Pam Bondion threat to crackdown on what the administration calls left wing terror; Jon Karl with the dramatic deadly strike on a Venezuelan boat President Trump claims was smuggling drugs into the U.S.; Trevor Ault has details on the two suspects authorities say tried to detonate a bomb they placed under a news van in Salt Lake City, Utah; and more on tonight's broadcast of World News Tonight with David Muir.