Generate a correct and concise answer for the question based on the words in the context.

Context : Also this year, in a ceremony in memory friend has died, a male friend (am Vinh Hung's guitar) and female singing has rendered Tuoi Hong Tho Ngay.
Question : What is the sex of am Vinh Hung?
male

Context : John J. Hoover was a billiard hall owner hanged by vigilantes on April 28, 1880, for the unprovoked murder of a townsman in Fairplay in Park County in central Colorado.
Question : For what crime was John J. Hoover prosecuted?
murder

Context : Cougar Helicopters Flight 91 (also known as Flight 491) was a scheduled flight of a Cougar Sikorsky S-92A (Registration C-GZCH) which ditched on 12 March 2009 en route to the SeaRose FPSO in the White Rose oil field and Hibernia Platform in the Hibernia oilfield off the coast of Newfoundland 55 kilometres (34 mi) east-southeast of St. John's, Newfoundland.
Question : When did Cougar Helicopters Flight 91 occurr?
12 March 2009