Spokesman Ron Levine says Morahan died Monday after a six-month struggle with leukemia.
He says the Republican lawmaker died at a hospital surrounded by family and friends.
Morahan was a state senator for over a decade, representing towns in the northern New York City suburbs of Rockland and Orange counties. During his tenure, he introduced 230 bills.
He may be best remembered for successfully advocating for Timothy's Law, which requires insurers to provide more mental health coverage. He was elected to the state Senate in 1999.
Morahan was born Oct. 11, 1931, in the Bronx.