His last email to the mailing list is from December 2021:
https://lore.kernel.org/qemu-devel/20211214075424.6920-1-zhanghailiang@xfusion.com/

Reviewed-by: Peter Xu <peterx@redhat.com>
Reviewed-by: Zhang Chen <zhangckid@gmail.com>
Signed-off-by: Lukas Straub <lukasstraub2@web.de>
---
 MAINTAINERS | 1 -
 1 file changed, 1 deletion(-)

diff --git a/MAINTAINERS b/MAINTAINERS
index 2458241e3cd45673d7228a3fecf2fe94f3b51b77..3c4eb3bc744e23dc3d49d14b24a0d576d7bd60d6 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -3865,7 +3865,6 @@ F: include/qemu/yank.h
 F: qapi/yank.json
 
 COLO Framework
-M: Hailiang Zhang <zhanghailiang@xfusion.com>
 M: Lukas Straub <lukasstraub2@web.de>
 S: Maintained
 F: migration/colo*

-- 
2.39.5