Johnny Manziel’s ex claims he threatened to kill her

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DALLAS - Has Johnny Manziel been a bad boy, lately?  His ex-girlfriend is blowing the whistle on little Johnny saying he threatened to kill her.

Police reports just released say Colleen Crowley claims Manziel told her "shut up or I'll kill us both."

Talk about unsportsmanlike conduct.  The alleged incident began during a physical altercation on January 30 in Dallas.

According to TMZ, Manziel denied the whole thing.  Police reports say Crowley became "increasingly uncooperative" when cops questioned her, and she refused to let them photograph her alleged injuries.

As far as the cops' game plan regarding Manziel, no charges will be filed.   A statement by Dallas PD says "Investigative efforts to date have not resulted in the filing of a criminal complaint and the incident is determined to be closed."