Nicholas Brendon, a co-star of "Buffy the Vampire Slayer" and actor of "Criminal Minds," has died at age 54. His death was announced by his family in a social media statement. Prior to his death, Brendon had been hospitalized after suffering a cardiac incident in 2022 and diagnosed with a congenital heart defect. He had also undergone spinal surgeries in recent years to address paralysis in his legs and genitals. The actor's surviving family members have asked for privacy as they mourn his loss.