L.A. Kings Star Drew Doughty -- To Be Cleared in Rape Investigation

L.A. Kings defenseman Drew Doughty is being investigated for rape following an incident back in March -- when a woman accused him of forcibly having sex with her -- but TMZ has learned, the D.A. will be rejecting the case.

Law enforcement sources tell TMZ, the woman in question filed a police report following the March 1st encounter -- claiming she bumped into Doughty at a bar in Hermosa Beach early that morning, and he asked her to come back to his place.

We're told ... the alleged victim told police she loudly rejected Doughty in front of his teammates -- calling him an "a**hole" -- and his teammates laughed.

Sources say the girl told police Doughty was embarrassed following the diss -- then wrangled her into a cab, took her home, and raped her.

The girl said she took a cab back to her place after the sex and later went to the hospital -- where police interviewed her and collected rape evidence.

The case has been under investigation since -- but police sources tell us, it will be rejected by the D.A. due to lack of evidence. We're told law enforcement has "major issues" with the woman's credibility.

Bottom line -- Doughty will be off the hook.