That win lifts Dundee into seventh spot but the losers will grab all the headlines.
Dundee United, who once regularly terrorised Europe's finest, will be scrapping it out in the second tier next season.
Good night...
SNSCopyright: SNS
'A broken club'
FT: Dundee 2-1 Dundee Utd
"Dundee United are a broken club," says BBC Sportound's Tom English. "There are a lot of faint hearts in that team and the Championship is not a place for the faint-hearted."
Dundee Utd manager Mixu Paatelainen
Talking to BBC Radio Scotland
"We need to make wholesale changes. There are so many slack areas in the football department. Everything starts from the field and we need to get a strong, hungry team out there.
"I am desperate to build this team again. It's a massive job. It's not easy but I'm more than motivated to do it."
Dundee Utd manager Mixu Paatelainen
Talking to BBC Radio Scotland
"Simply not good enough. We threatened after we took the lead but then what happens? We lose two set-piece goals. It's soft. The same things happen again and again. If you have so many players with a slack attitude that's what happens."
Underperforming United
FT: Dundee 2-1 Dundee Utd
"It must be horrible to be in that dressing room," former Dundee United forward and coach Darren Jackson tells BBC Radio Scotland listeners. "I honestly believed they were good enough to get out of trouble. That squad should not be getting relegated."
Piling on the misery
FT: Dundee 2-1 Dundee Utd
Football fans can be a cruel lot... The Dundee fans are slow to leave the stadium as they revel in their neighbours' relegation.
SNSCopyright: SNS
Dundee manager Paul Hartley
Talking to BBC Radio Scotland
"We're a good team and we keep going to the end. I'm proud of my players. We've beaten last season's points tally and we want to finish seventh."
Post update
FT: Dundee 2-1 Dundee Utd
I guess United fans have known this day was coming for quite a while now but to have the final blow delivered by your city rivals has got to hurt.
The TV cameras are busy picking out dejected faces in the away end at Dens Park.
Dundee United are down
FT: Dundee 2-1 Dundee Utd
Well, that performance sums up what has been a wretched season for Dundee United. On the back foot for the first half then getting their noses in front only to throw it away by conceding two of the scruffiest goals you will ever see.
SNSCopyright: SNS
FULL-TIME Dundee 2-1 Dundee Utd
Dundee come from behind to tip neighbours United over the edge and into the Championship for next season.
GOAL Dundee 2-1 Dundee Utd (Wighton)
That's United sunk now... Greg Stewart works the free-kick to Craig Wighton and the young forward's shot slips through a forest of legs to creep inside the far post.
Post update
Dundee 1-1 Dundee Utd
Another yellow card as Sean Dillon slides in late on Kane Hemmings. That will eat up some time.
Post update
Dundee 1-1 Dundee Utd
Four minutes of time added on... United need a goal to save their skin.
Post update
Dundee 1-1 Dundee Utd
United keeper Eiji Kawashima has to leap up and tip over a looping header from Darren O'Dea. The visitors then make their last change as Billy McKay replaces Blair Spittal. They've got to go for it in these last few minutes...
Post update
Dundee 1-1 Dundee Utd
It's all kicking off now and Willie Collum might get a repetitive strain injury as he flashes a series of yellow cards. Greg Stewart hacks down Paul Dixon and keeper Eiji Kawashima gets involved in a spot of pushing and shoving. Paul Paton then thunders into a late tackle on Craig Wighton.
GOOD SAVE!
Dundee 1-1 Dundee Utd
Kane Hemmings throws himself at a lovely Greg Stewart's cross drawing an acrobatic save from Eiji Kawashima.
Post update
Dundee 1-1 Dundee Utd
Chris Erskine does well to make room for a shot with a surging run but he ruins that good work by hurriedly lashing a rising shot in on goal. A corner is given but Scott Bain is claiming he didn't get a touch and gets booked for his trouble.
GOAL Dundee 1-1 Dundee Utd (Hemmings)
It's not a thing of beauty but it counts and it could mean the end for Dundee United. Kosta Gadzhalov rises highest from a corner and his header somehow makes it over the line, with Kane Hemmings claiming a touch on the goal-line.
GOOD SAVE!
Dundee 0-1 Dundee Utd
Big chance for Edward Ofere to score again as he runs on to a great through ball from Kevin Knoyle but he can only prod his shot against Scott Bain, who off his line quickly and down to block.
Post update
Dundee 0-1 Dundee Utd
Simon Murray has put in a real shift for United and he is off for a well-earned breather as Chris Erskine is on for the closing stages.
Live Reporting
Colin Moffat
All times stated are UK
Get involved
SNSCopyright: SNS 
SNSCopyright: SNS 
SNSCopyright: SNS
Latest PostDismal end for Dundee United
FT: Dundee 2-1 Dundee Utd
That win lifts Dundee into seventh spot but the losers will grab all the headlines.
Dundee United, who once regularly terrorised Europe's finest, will be scrapping it out in the second tier next season.
Good night...
'A broken club'
FT: Dundee 2-1 Dundee Utd
"Dundee United are a broken club," says BBC Sportound's Tom English. "There are a lot of faint hearts in that team and the Championship is not a place for the faint-hearted."
Dundee Utd manager Mixu Paatelainen
Talking to BBC Radio Scotland
"We need to make wholesale changes. There are so many slack areas in the football department. Everything starts from the field and we need to get a strong, hungry team out there.
"I am desperate to build this team again. It's a massive job. It's not easy but I'm more than motivated to do it."
Dundee Utd manager Mixu Paatelainen
Talking to BBC Radio Scotland
"Simply not good enough. We threatened after we took the lead but then what happens? We lose two set-piece goals. It's soft. The same things happen again and again. If you have so many players with a slack attitude that's what happens."
Underperforming United
FT: Dundee 2-1 Dundee Utd
"It must be horrible to be in that dressing room," former Dundee United forward and coach Darren Jackson tells BBC Radio Scotland listeners. "I honestly believed they were good enough to get out of trouble. That squad should not be getting relegated."
Piling on the misery
FT: Dundee 2-1 Dundee Utd
Football fans can be a cruel lot... The Dundee fans are slow to leave the stadium as they revel in their neighbours' relegation.
Dundee manager Paul Hartley
Talking to BBC Radio Scotland
"We're a good team and we keep going to the end. I'm proud of my players. We've beaten last season's points tally and we want to finish seventh."
Post update
FT: Dundee 2-1 Dundee Utd
I guess United fans have known this day was coming for quite a while now but to have the final blow delivered by your city rivals has got to hurt.
The TV cameras are busy picking out dejected faces in the away end at Dens Park.
Dundee United are down
FT: Dundee 2-1 Dundee Utd
Well, that performance sums up what has been a wretched season for Dundee United. On the back foot for the first half then getting their noses in front only to throw it away by conceding two of the scruffiest goals you will ever see.
FULL-TIME Dundee 2-1 Dundee Utd
Dundee come from behind to tip neighbours United over the edge and into the Championship for next season.
GOAL Dundee 2-1 Dundee Utd (Wighton)
That's United sunk now... Greg Stewart works the free-kick to Craig Wighton and the young forward's shot slips through a forest of legs to creep inside the far post.
Post update
Dundee 1-1 Dundee Utd
Another yellow card as Sean Dillon slides in late on Kane Hemmings. That will eat up some time.
Post update
Dundee 1-1 Dundee Utd
Four minutes of time added on... United need a goal to save their skin.
Post update
Dundee 1-1 Dundee Utd
United keeper Eiji Kawashima has to leap up and tip over a looping header from Darren O'Dea. The visitors then make their last change as Billy McKay replaces Blair Spittal. They've got to go for it in these last few minutes...
Post update
Dundee 1-1 Dundee Utd
It's all kicking off now and Willie Collum might get a repetitive strain injury as he flashes a series of yellow cards. Greg Stewart hacks down Paul Dixon and keeper Eiji Kawashima gets involved in a spot of pushing and shoving. Paul Paton then thunders into a late tackle on Craig Wighton.
GOOD SAVE!
Dundee 1-1 Dundee Utd
Kane Hemmings throws himself at a lovely Greg Stewart's cross drawing an acrobatic save from Eiji Kawashima.
Post update
Dundee 1-1 Dundee Utd
Chris Erskine does well to make room for a shot with a surging run but he ruins that good work by hurriedly lashing a rising shot in on goal. A corner is given but Scott Bain is claiming he didn't get a touch and gets booked for his trouble.
GOAL Dundee 1-1 Dundee Utd (Hemmings)
It's not a thing of beauty but it counts and it could mean the end for Dundee United. Kosta Gadzhalov rises highest from a corner and his header somehow makes it over the line, with Kane Hemmings claiming a touch on the goal-line.
GOOD SAVE!
Dundee 0-1 Dundee Utd
Big chance for Edward Ofere to score again as he runs on to a great through ball from Kevin Knoyle but he can only prod his shot against Scott Bain, who off his line quickly and down to block.
Post update
Dundee 0-1 Dundee Utd
Simon Murray has put in a real shift for United and he is off for a well-earned breather as Chris Erskine is on for the closing stages.