Officers responded to a report of a shooting at Twinbridge Circle near Longbrook Way just before noon.
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Witnesses reported hearing multiple gunshots with two victims injured and lying on the ground, officers said.
The victims were taken to John Muir Medical Center in Walnut Creek. Police said a 67-year-old man died at the hospital.
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Police said the identities of both victims are withheld pending contact with family members.
This is the second homicide of the year.
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Police are looking for a male suspect. No arrests have been made.
Any person with information related to this crime is encouraged to contact the Pleasant Hill Police Investigations Bureau at (925) 288-4630.
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