Mark John Dreibelbis was a 15-year-old boy from Santa Cruz, California, who was killed on February 10, 1973. He and three other teenage boys — Robert Michael Spector, David Allan Oliker, and Brian Scott Card — were camping in Henry Cowell Redwoods State Park when Herbert Mullin encountered them. Mullin, posing as a park ranger, ordered the boys to leave; when they refused he returned the next day and shot them. Their bodies were found on February 17, 1973.

Mullin was part of a wider killing spree in late 1972 and early 1973 that claimed 13 victims. He later said he believed the murders would prevent earthquakes and described hearing voices and telepathic communications; at trial the jury rejected an insanity defense and convicted him of multiple counts of murder. His arrest on February 13, 1973, ended the spree that occurred alongside another series of murders in the area.

Did anyone in the community know Mark John Dreibelbis or the other boys and have details that could add to the record?