Sanchez said the driver was a 22-year-old man who was on his way home from a holiday party.
Walcott said the second officer suffered minor injuries.
The California Highway Patrol says one of its officers died when a auto he was riding in was hit on a San Francisco Bay Area highway.
CHP Assistant Chief Ernie Sanchez named the dead officer as 33-year-old Anthony Camilleri Sr., who leaves behind three children and his wife, CBS San Francisco reported.
Assistant Chief Ernest Sanchez said at at a Monday morning press conference that a speeding red Cadillac hit the back of the patrol auto Camilleri and Velasquez were in, reports CBS San Francisco.
The crash happened Sunday night, Christmas Eve, on Interstate 880 in Hayward.
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"The impact was so severe that it turned a utility vehicle into a compact vehicle", a CHP official said at a Christmas morning news conference.
He said that it's not just because the CHP lost one of its own but that too many fatalities have occurred, just in the past couple of weeks, in the Bay area because of people driving under the influence. Police were called to the scene late Sunday evening after receiving a report about a collision involving a auto that rear-ended a CHP patrol vehicle.
California Gov. Jerry Brown issued a statement about the crash.
Camilleri is made due by his significant other, three kids - a girl and two children, all between the ages of 2 and 12 years of age - his folks, and two kin. The suspect was taken to a hospital where their condition has not yet been released.
Flags at the state Capitol will be flown at half-staff in honor of Camilleri, Brown said.More news: Alexis Sanchez set for lucrative free transfer to Manchester City