His second wife Michelle said he died of natural causes.
"Gerry was my first love," King said in a statement Thursday. "He had a profound impact on my life and the rest of the world. Gerry was a good man and a dynamic force, whose words and creative influence will resonate for generations to come."
Goffin grew up in Queens with his mother and grandfather, whom he described as difficult. He said he was an introverted child who had a gift for science and a secret passion for music.
He met fellow New Yorker King when both were students at Queens College. They married in August 1959, when he was 20 and she was 17.
They began a songwriting partnership in which she composed most of the music and he wrote most of the lyrics. They wrote dozens of bad songs while he worked as a chemist and she took a secretarial job.
King wanted to write rock 'n' roll.
Rock 'n' roll won out when they had their first hit, "Will You Still Love Me Tomorrow," a No. 1 in 1961 for the Shirelles.
Goffin said that when "Will You Still Love Me Tomorrow" reached No. 1, they took a limousine to his chemical-testing job so he could tell his boss there he quit. He was 21.
Goffin and King became one of several star writing teams at New York's famous Brill Building in the early 1960s, along with Ellie Greenwich and Jeff Barry and Cynthia Weil and Barry Mann.
Goffin and King wrote often for "girl groups" like the Cookies ("Chains") the Chiffons ("One Fine Day") and Little Eva, who was their babysitter and had a No. 1 hit with their dance workout "The Locomotion."
They also had hits like "Take Good Care of My Baby" for Bobby Vee, "Every Breath You Take" for Gene Pitney, "Pleasant Valley Sunday" for the Monkees, "Crying in the Rain" for the Everly Brothers, "Up On the Roof" for the Drifters and the sentimental "You've Got a Friend" for James Taylor.
Goffin and King divorced in 1968, though they continued to collaborate periodically. King said in her autobiography that Goffin had ongoing problems from his LSD use in the 1960s.
Their relationship is dramatized in the Broadway musical "Beautiful."
His later songs included the Whitney Houston hit "Saving All My Love For You" and Diana Ross's "Theme From Mahoghany," both of which he cowrote with Michael Masser.
He and King were inducted into the Songwriters Hall of Fame in 1987 and the Rock and Roll Hall of Fame in 1990.
He is survived by his wife and five children.
At last night's performance of "Beautiful: The Carole King Musical" at the Sondheim Theatre, the cast dedicated the performance to him, and they dimmed the lights at the theater.
Read more: http://www.nydailynews.com/entertainment/music-arts/gerry-goffin-carole-king-ex-husband-songwriting-partner-dead-75-article-1.1836676#ixzz35JoDE6gq