Lindsay Lohan -- Prosecutors Slam Door on Plea Deal

Prosecutors have ended plea negotiations with Lindsay Lohan and are preparing for a trial Monday ... this according to law enforcement sources.

We're told negotiations broke down because Lindsay won't accept ANY punishment for lying to cops in connection with her car accident last June. As we reported, Lindsay told police she was NOT driving the Porsche that crashed into a truck on Pacific Coast Highway -- she was.

Fact is ... negotiations were doomed from the get-go, because Lindsay's lawyer, Mark Heller, did not have his client on board when he tried cutting a deal.

There's one other chance of avoiding trial. Everyone must be in court Monday, and Lindsay's lawyer could try and enter a plea, but given Lindsay's state of mind ... it's highly unlikely.