短语讲解：

1. His second marriage, to Saturday Night Live performer Gilda Radner, ended when she died of ovarian cancer in 1989.

die of 死于（疾病、过度悲伤等）
例句：Nowadays many people die of cancer.
现在有很多人死于癌症。

2. Wilder spent much of his time after her death speaking in support of cancer research.

in support of 支持; 证明…正确
例句：The retort raised a cheer in support of the speaker.
发言人这一反驳博得了一片支持的欢呼声。