A man has been identified as 62-year-old Alvin Salinas, Sr., according to the Alameda County coroner’s office.
The coroner's office has yet to determine a cause of death. The city of his residence was not immediately known.
Salinas was found around 10:20 a.m. in the area of the park between Santa Susana and San Rafael Way. Paramedics responded to the area and attempted to revive the man to no avail.
He was pronounced dead at the scene, police said.
There were no apparent signs of trauma or foul play, police said Thursday.
Anyone with information is asked to contact the Union City Police Department at 510-471-1365. Anonymous tips can also be left at 510-675-5207 or by emailing email@example.com.