| Ms Park has also lost her presidential immunity and can be prosecuted |
South Korea's President Park Geun-hye has become the country's first democratically elected leader to be forced from office.
| There have been growing scenes of anger outside the Seoul court |
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| The panel of judges have deliberated on the impeachment decision for months |
Why did Park lose her job?
At the heart of the drama lies the close friendship between the president and Ms Choi. Ms Choi is accused of using her presidential connections to pressure companies to give millions of dollars in donations to non-profit foundations she controlled.| Park supporters turned on police vans outside the court |
| Many who had gathered in the streets of Seoul calling for Ms Park's dismissal celebrated the court's decision |
| Ms Choi (centre) has been accused of bribery and corruption |
The court said she had broken the law by allowing Ms Choi to meddle in state affairs, and had breached guidelines on official secrets by leaking numerous documents.
| Distraught supporters of Ms Park wept outside the constitutional court in Seoul after the verdict was announced |
But the judges dismissed some charges, including accusations Ms Park had infringed on freedom of the press by creating a media blacklist of cultural figures, and criticism of her response during the 2014 Sewol ferry disaster.
What happens now?
Ms Park was already suspended from presidential duties, with the prime minister taking over her responsibilities. But she must now leave office - and her official residence - and a presidential election will be called within the next 60 days.She has also lost her presidential immunity so could now face criminal charges over allegations she colluded with Ms Choi.
What has been the reaction?
As the various twists and turns of the scandal came to light public fury across South Korea intensified, with many staging demonstrations calling for her to step down.The final decision is being celebrated by many, but as the verdict came through angry scenes erupted outside court. Pro-Park protesters - mostly older conservatives - turned on police. Two people believed to be pro-Park died.
South Korea's Yonhap news agency reported that one was killed when a loudspeaker fell on them, while an elderly man fell from a police van.
What does it mean for South Korea?
Besides a possible criminal trial for Ms Park, there is also the ongoing prosecution of Ms Choi.The de-facto head of Samsung, Lee Jae-yong, is also on trial for a string of corruption charges linked to the scandal.
Analysts say the protests in recent months have sent a strong signal that the close relationship between politicians and the chaebols - large family businesses that dominate the economy - needs to change.
A new election could change the political landscape of South Korea. But society remains deeply divided.