Simon Cowell shared his reaction to the death of One Direction’s Liam Payne, whose career was kickstarted when Cowell was a judge on the U.K.’s The X Factor. "You never really know how you feel about someone until a moment like this happens.

Cowell created and judged “The X Factor,” the show on which he and fellow judges put together Payne’s band, One Direction, in 2010.

Friends, family and collaborators have expressed shock and sadness over the death of former One Direction singer Liam Payne, who has died in Buenos Aires, Argentina at age 31