He was 69.
The family announced his death on Facebook early today. Sarraj was born in British-ruled Palestine in 1944. His family fled to the Gaza Strip four years later during the war over Israel's creation.
Trained in Egypt and Britain, Sarraj established a community mental health program in Gaza in 1990 and became a human rights defender. In that role, he took on both Israel and the Palestinian self-rule government. His biography says he was briefly jailed by both.