Pat JaCoby, a spokeswoman for the University of California at San Diego, told ABC News that Margo and Grace Ucar were among the graduates during the last winter quarter from the university's Revelle College. Both are listed as human biology majors among the students listed for the 2008 commencement. At one point during college, Margo changed the spelling of her name from Margeaux with the registrar's office, JaCoby said.
Sea Pointe Estates is a gated community of more than 70 homes perched on a hillside overlooking the Pacific Ocean in San Clemente, Calif., at the southern edge of Orange County.
Roxie Weaver, who lives inside Sea Pointe, said her daughter attended the local high school with the Ucar twins, who, she said, always dressed alike in school.
"They're our neighbors and we're very saddened by this horrible tragedy," Weaver said. "We're all mortified by this whole thing."
Weaver described the gated community as private and quiet.
"This type of horrific thing only shows you the condition of our world," Weaver said. "You may live in what you think is a paradise, but sometimes it isn't."