Alexandra Tang

Alexandra Tang (Family Photo)

LAGUNA HILLS, Calif. (KTLA) -- The family of Alexandra Tang, the 24-year-old woman allegedly killed by her boyfriend, spoke out for the first time in interviews with KTLA.

Tang's sister Candice Tang Nyholt recalled the phone call she received from her mother about Alexandra's death.

"She said, 'Candice, we lost Sandra,'" a choked up Nyholt recalled. "I was just in shock, and I thought it was a really bad joke," she said.

Police say Alexandra was stabbed to death by her college sweetheart Derek Pinski, also 24, at the Laguna Hills home of Pinski's mother. The couple had been staying there.

Derek's mother came home Saturday morning after running a few errands and found Alexandra dead in bed, according to police.

She called 911 and tried to resuscitate her, but Alexandra was pronounced dead at the scene.

Pinski had fled prior to his mother getting home. Authorities caught up with him later in the day at his father's home in Mesa, Arizona and arrested him.

He now faces a felony count of murder with a sentencing enhancement for the personal use of a deadly weapon, according to a statement from the Orange County district attorney's office.

Alexandra's family says that they did not see this coming.

"Like how could you? She cared about you," Nyholt wondered.

Alexandra and Derek met when they were both students at UC Santa Barbara.

After graduating, Alexandra moved down to Orange County because she had gotten a job helping autistic children.

Alexandra's parents are beside themselves with grief over their daughter's death.

"It's a sickening feeling," her father, Alexander Tang, told KTLA. "My blood pressure shot up and my chest was so tight."

Her father says that he will forever miss his little girl's love.

"Up until know she still told me, 'I love you, Dad,'" he recalled. "A lot of kids, when they become a teenager, they stop saying those things. But she never did."

The process to extradite Pinski to Orange County is underway. Prosecutors are asking that Pinski be held on $1 million bail.