Miyu Matsuki (松来未祐) was a Japanese actress, movie star and voice actress. She was born on September 14th, 1977 in Kure, Hiroshima Prefecture, Japan. Her talent agency 81 Produce confirmed on November 2nd, 2015 that she died on October 27th, 2015 due acute pneumonia at the age of 38. She had taken time off as of July 2015 to combat the health problem but unfortunately the treatment was unsuccessful.

She was best known to Pocket Monsters anime fans as the Japanese voice of Caitlin who appeared in Pocket Monsters Best Wishes Season 2


Source: http://www.81produce.co.jp/ and http://www.81produce.co.jp/list.cgi?lady+6133126273000