Andrew Notohamiprodjo was Cooper's ballroom dance teacher three years ago and later supervised her as a teaching assistant in ballroom dance. Cooper was looking forward to graduating but planned to stay in town another year, he said.
"She was a lot of fun, super forward," he said.
Cooper graduated from Ruben S. Ayala High School in Chino Hills in 2010.
CHRISTOPHER ROSS MICHAELS-MARTINEZ
Michaels-Martinez, 20, was an English major from Los Osos, California, who planned to go to London next year and to law school after graduation, his father, Richard Martinez, said at a Saturday press conference.
He pulled out a photo of his son as a small child in a Chicago Cubs baseball uniform and said they used to call him "mini-Sammy Sosa," referring to the former Cubs star.
"Chris was a really great kid," Martinez said. "Ask anyone who knew him."
Friends said Michaels-Martinez, who served as residential adviser at a dorm last year, was the kind of guy who would welcome strangers into his home.
VERONIKA ELIZABETH WEISS
Weiss, 19, was first-year student from Westlake Village, California.
"She was always a happy person," said Eric Pursley, who worked with Weiss at a Target store in Thousand Oaks last year.
Weiss was a water polo player at Westlake High School who earned league honors during her senior year, according to the Thousand Oaks Acorn newspaper.