According to this news report http://www.bbc.com/news/uk-england-nottinghamshire-27292918, a jw cut his wrist but was caught before he died. If only a blood transfusion will save his life, he is refusing based on belief as a JW and is supported on that, including his JW father.
It's funny many religions put suicide as a really bad sin, but in this case it shows on jw standards taking blood is worse then suicide. Where are the scriptures to support that?