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Public violence and recent tragedy, including the deaths of Charlie Kirk and Iryna Zarutska, have left many shaken by what they have seen.

For witnesses, whether seeing the event in person or on a screen, these memories can be difficult to shake, potentially developing into grief and trauma.

Jonathan Alpert, a New York psychotherapist and author of the upcoming book "Therapy Nation," reflected on the common mental health effects of witnessing a traumatic event, such as a murder, in an interview with Fox News Digital. (See the video at the top of the article.)

HOW TO COPE WITH ‘COLLECTIVE GRIEF’ WHEN MASS TRAGEDY STRIKES

These effects may include shock, fear, hypervigilance, difficulty sleeping and a mental replaying

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