<P> 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 . </P>
<P> 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 . </P>
when does diane leaves frasier at the altar
when does diane leaves frasier at the altar
start of the fourth season
start of the fourth season