TMZ has learned Los Angeles Angels starting pitcher Nick Adenhart was killed in a felony hit-and-run car accident in Fullerton, California early this morning -- hours after he pitched in a game last night.

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Cops say someone driving a minivan blew through a red light, causing the Mitsubishi that Adenhart and three others were riding in to hit a light pole. Three of the four people in the Mitsubishi were killed in the crash -- Nick, another man and a woman -- while the fourth person remains in the hospital.

Cops say the person driving the van fled the scene -- but was later caught and charged with felony hit-and-run. The suspect is also being treated for injuries in a local hospital.

We're told one of the other men killed in the crash was also affiliated with the Angels organization.

Nick was 22 years old.