Doris Roberts Died of a Stroke

5/6/2016 3:27 PM PDT

Doris Roberts Died of a Stroke

EXCLUSIVE

Doris Roberts died from a massive stroke ... according to her death certificate.

TMZ obtained a copy of the doc, filed in L.A. County Court -- and it reveals the "Everybody Loves Raymond" star had been suffering from hypertension for years.

The immediate cause of death though ... was a "large hemorrhagic cerebrovascular accident" ... the medical term for a stroke.

Doris died at home last month. She was 90 years old.