Rap legend Heavy D -- one of the most influential rappers of the '90s -- died earlier today ... TMZ has learned.

Heavy D -- real name Dwight Arrington Myers -- was rushed to an L.A. hospital around noon today ... and was pronounced dead at the hospital at 1 PM. He was 44 years old.

We've learned a 911 call was placed from Heavy's Beverly Hills home around 11:25 AM to report an unconscious male on the walkway .

When help arrived, we're told Heavy D was conscious and speaking -- and was transported to a nearby hospital.

He died a short time later.

Cops are investigating the death -- and so far, there are no obvious signs of foul play.

Heavy D had several massive hits -- including "Now That We Found Love." He also wrote and performed the theme song for "In Living Color" ... and appeared as an actor in the movie "Life."

Heavy just performed at the BET Awards in October -- and appeared to be fine.

Story developing ...