RELATED: Family friend mourns 21-year-old pregnant woman, baby killed in San Jose hit-and-run
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Police say they arrested the suspect on Saturday, four days after the deadly crash at Blossom Hill Road and Winfield Boulevard.
According to investigators, the car driven by the suspect, a white Hyundai sedan, was stolen.
Two others in that car remain on the loose.
The woman killed has been identified as 21-year-old April Zoglauer.
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Zoglauer was pronounced dead at a local hospital and doctors were originally able to save her baby by emergency surgery. But just 24 hours later, the baby died at the hospital.
MORE: Mother killed, twin boys injured by suspect in stolen car following East Bay pursuit, police say
A family friend set up a GoFund Me Page to help with expenses.