Vaughn Boatner was arrested in a residential neighborhood with the help of Seattle police and members of the Kings County Sheriff's Office.
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He was booked on suspicion of homicide, attempted homicide, child endangerment and being a felon in possession of a firearm, and is being held without bail, Hayward police said.
He is accused of shooting and killing his former girlfriend, 30-year-old Monique Aldridge, who was also the mother of his 5-year-old son, on May 11 inside a home in the 100 block of Cassia Drive.
Boatner is also suspected of shooting and injuring Aldridge's boyfriend, identified only as a 30-year-old Oakland man.
The 5-year-old boy was also at home at the time of the shootings but wasn't injured, police said.
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Anyone with information is asked to call Hayward Police Detective Green at (510) 293-7176.
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