Jail records show that Brian David Olivarez was released at 6:44 p.m. and that his initial arrest Saturday has been deemed a detention.
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The records cite Olivarez was released under California penal code 849(B)(1), which authorizes police to release arrestees due to insufficient grounds to file a complaint.
The Los Angeles County District Attorney's office said in a statement to Eyewitness News that the case was "referred back to law enforcement for further investigation."
Officer Darrell Cunningham and another person riding with Cunningham were killed after police say Olivarez, driving at more than 100 miles per hour, failed to stop at a red light and struck the car, LAPD Chief Michel Moore said at a press conference over the weekend.
Off-duty LAPD officer ID'd as 1 of 2 people killed in Northridge crash; DUI suspect among 3 injured
An off-duty San Bernardino County deputy sheriff, another passenger in the car with Cunningham, was injured in the crash.
A preliminary investigation indicated that Olivarez "was under the influence of alcohol at the time of this collision," Moore said, adding that he would be booked for gross vehicular manslaughter "and additional charges as further evidence is gathered."
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The collision was reported about 1:15 a.m. Saturday at the intersection of Roscoe Boulevard and Lindley Avenue in Northridge, according to the Los Angeles Fire Department.
Cunningham had been with the department for just under five years and was last on duty just two nights before the crash.
The Associated Press contributed to this report.