The Talmud says you do. Our judicial system does not meet even the minimal standards demanded by the Torah for Noachide courts.
We’re obligated to observe the “law of the land”, regardless of whether it’s consistent with Talmudic law.
The police executed him without trial, without due process.
He died due to his failure to cooperate with the police, who were required by the situation to use force. Whether they did anything unlawful will be determined by the on-going legal process.