Police say the two victims were walking around 1:45 a.m. along Prairie Avenue, near El Segundo Boulevard, when a driver hit them and took off.
Evidence at the scene led police to a home in Hawthorne, where they arrested a suspect for driving under the influence and hit-and-run.
Another driver struck a Hawthorne police car during that investigation.
Nobody was hurt in that crash and police say driving under the influence was not the cause for the second crash.