The most recent whale washed ashore in Pacifica on Apr. 16.
RELATED: Experts, community concerned over dead whales discovered in the Bay Area
After performing a necropsy, The Marine Mammal Center of Sausalito says the whale died from blunt force trauma that can be blamed on a ship strike.
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A whale found days before in Richmond likely also died after being hit by a ship. It had deep propeller wounds that had severed its tail, or fluke.
RELATED: Why gray whales may be starving to death along the California coast
There's no cause of death yet for a whale which washed ashore near Hercules on Apr. 13.
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Seven gray whales have died in the bay area over the last two months.
Three died from malnutrition and three from ship strikes.
See more stories and videos about whales.