Police believe John Buchanan assaulted 46-year-old Jaynie Sauter after an argument at their home in the Willmore neighborhood the morning of Dec. 4.
No one reported injuries, but police found bullets at the scene.
A search warrant reveals new information about the crash, including that police believe the SUV was traveling at least 71 mph when it hit the Awaida family.
Police believe the suspects robbed Signal Hill Jewelry & Novelties around 12:30 p.m.
She is believed to be staying in hotels in the area, but a family member told police they lost communication, which is unusual behavior.
One person, a member of the military, surrendered earlier in the morning, but it took authorities until about noon to get the other man out, authorities said.
Police will hold the checkpoint from 8 p.m. to 3 a.m. somewhere in Signal Hill on Friday night.
As a precaution, authorities evacuated a nearby parking lot and a parking structure in the rental car area.
Investigators didn’t reveal how they identified the suspected shooter, but they arrested him in Long Beach a day after the crime, jail records show.
Signal Hill police shut down the area around 19th Street and Dawson Avenue.