1N-COUNT 死刑执行令 A death warrant is an official document which orders that someone is to be executed as a punishment for a crime. 死刑执行令
2PHRASE 自寻死路;自取灭亡 If you say that someone is signing their own death warrant, you mean that they are behaving in a way which will cause their ruin or death. 自寻死路;自取灭亡
By accusing the King of murder, he signed his own death warrant.