A 27-year-old man has been charged with murder in the death of "Last Chance U" star John Beam ... officials announced Monday.

According to court docs, Cedric Irving Jr. admitted to shooting Beam at Laney College in Oakland on Thursday ... and had the handgun used in the disgusting act in his possession at the time of his arrest at the San Leandro BART station at 3 AM the next morning.

Beam was shot in the head and rushed to a nearby hospital ... but tragically, he died from the injuries he sustained.

At a press conference, Alameda County DA Ursula Jones Dickson said Irving is facing 50 years to life if convicted.

Jones Dickson added Irving -- who is being held without bail -- did not have a criminal record. Netflix

It's unclear if there is a connection to Irving and

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