I do not believe it is there any more, at least as a Marriott Hotel.
You might want to try this outstanding hotel though!!!
I went to St. Kitts several consecutive years with my family (two young kids - now 6 and 3....). Great resort. The island is moderately developed - the Marriott is the only major resort. I used the (recently eliminated) all-inclusive packages at the hotel which worked out well. Great pool area, beach is decent but not spectacular. Good place to just chill for a week. The vacation club units are really nice. The hotel portion has a disproportionate number of suites so I was very lucky with upgrades.