Diane also has on - and - off relationships with womanizing bartender Sam Malone, who is her non-intellectual opposite. When Sam and Diane end one of their relationships at the end of the second season, she goes to a psychiatric hospital in the following season and meets its psychiatrist Frasier Crane, initially Sam 's rival who eventually becomes a regular character and then has his own spin - off. At the end of the season, Diane leaves Boston to marry Frasier in Europe. However, at the start of the fourth season, she jilts Frasier at the wedding altar. In the fifth season, after Sam ended his relationship with politician Janet Eldridge (Kate Mulgrew), Sam cyclically proposes to Diane, who repeatedly rejects his proposals until she accepts one of his latest proposals in the episode "Chambers vs. Malone '' (1987). In the season finale, "I Do, Adieu '' (1987), when Diane is offered the chance to fulfill her dream of becoming a writer, Sam and Diane halt their wedding. Therefore, she leaves Boston, promising him that she will return to him for six months. However, in the series finale, "One for the Road '' (1993), after six years of separation, Diane returns to him as the award - winning cable television writer. Both try to rekindle their romance for old times ' sake and plan to leave Boston together for Los Angeles. However, they begin to reconsider their relationship and then amicably break it off. Therefore, Diane returns to Los Angeles without Sam.
when does diane leaves frasier at the altar
start of the fourth season