The Charlie Kirk murder investigation had a big break, leading to an arrest on Thursday. The early stages of the case have some striking similarities to the Boston Marathon bombing investigation, according to a former agent who worked on the Massachusetts manhunt.

Soon after the chaotic Boston bombing scene developed - it quickly turned into a massive manhunt just like the murder of Charlie Kirk in Utah.

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Former FBI Boston Special Agent in Charge Rick DesLauriers says both cases involved labor-intensive scanning of surveillance video.

"These video images were high-quality," explained DesLauriers. "They were high-quality in the Boston Marathon investigation, too, and that is critical to allowing the members of the A

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