‘Glee’ Star Dianna Agron — Radio Silence After Cory Monteith Tribute

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There were no words … “Glee” star Dianna Agron refused to answer questions about Cory Monteith“s death Saturday … this just moments after leaving a concert dedicated to her fallen co-star.

Our photog spotted Dianna — who played one of Cory”s love interests on the show —  leaving the Roxy in L.A. She had been there with fellow “Glee” kids Kevin McHale and Jenna Ushkowitz to watch co-star Chord Overstreet perform.

Before the show started, Chord dedicated the gig to Cory, reportedly shouting out “I love you buddy.” He then sang “Billionaire” … one of the first songs he performed with Cory on “Glee”.