IRVINE (CBSLA.com) — A joint burial is being planned for an engaged Orange County couple who were found dead inside a car at their Irvine condo complex.

Keith Lawrence, 27, and 28-year-old Monica Quan were found shot to death Sunday night on the rooftop parking deck of their condo complex located at 2100 Scholarship, officials said.

READ MORE: Garcetti: 88,000 Vaccines To Be Given Out During The Week At City Sites

Lawrence, a public safety officer at USC, and Quan, an assistant basketball coach at Cal State Fullerton, were college sweethearts at Concordia University.

Their murders were still under investigation Tuesday, however, Irvine police have determined that they were not victims of a robbery.

READ MORE: 'I Was Desperate': Prince Harry And Meghan's Bombshell Interview

“I think it’s a random act of violence, because you know what? Those two, they were real good people. I just know that they’re together,” Lawrence’s father, Keith, said.

No suspect information has been released.

MORE NEWS: Woman, Child Found Dead Inside Rancho Cucamonga Home

Autopsies for the couple have been planned for Tuesday.