It started when Los Angeles County sheriff's deputies happened to see the unidentified suspect hit the woman with his car at about 8:30 p.m. in the 9400 block of Normandie Avenue Saturday night.
The victim suffered a broken leg, officials said.
The suspect, who deputies said was armed with a gun, ran off after the crash and barricaded himself in an apartment in the area. A woman and her daughter were inside at the time but managed to get out safely, according to sheriff's officials.
The suspect eventually surrendered to authorities and was arrested.
Meanwhile, a suspected drunk driver hit a sheriff's unit at the scene. He was also arrested.
No deputies were hurt in either incident.