Read more: http://blog.seattlepi.com/candacewhiting/2015/10/12/killer-whale-dies-following-the-muddy-disaster-at-marineland/
Code Animal in France have written a blog about Valentin's life and death. They have also released a video of Valentin displaying stereotypic behaviour at Marineland Antibes, recorded by the organisation when they visited the park on August of this year.
You can read the blog (French) & watch the video here: http://www.code-animal.com/valentin-1996-2015/
The BBC have also released an article about Valentin's death and the horrific situation in France that still continues for the remaining orcas: http://www.bbc.co.uk/newsbeat/article/34515872/french-water-park-marineland-criticised-after-killer-whale-dies