Background: Yagan (; c. 1795 - 11 July 1833) was an Indigenous Australian warrior from the Noongar people. He played a key part in early resistance to British colonial settlement and rule in the area surrounding what is now Perth, Western Australia. Yagan was pursued by the local authorities after he killed a servant of Archibald Butler in an act of retaliation after Smedley, another servant of Butler, shot at a group of Noongar people taking potatoes and fowls, killing one of them. The government offered a bounty for Yagan's capture, dead or alive, and a young settler, William Keats, subsequently shot and killed him.
Context: On 11 July 1833, two teenage brothers named William and James Keates were herding cattle along the Swan River north of Guildford when a group of Noongar approached while en route to collect flour rations from Henry Bull's house. The Keates brothers suggested Yagan remain with them to avoid arrest. While he was staying with them during the morning, the brothers decided to kill the warrior and claim the reward. When the natives were ready to depart, the Keateses took their last opportunity. William Keates shot Yagan, and James shot Heegan, another native, in the act of throwing his spear. The brothers ran away, but other Noongar overtook William and speared him to death. James escaped by swimming the river. Shortly afterward he returned with a party of armed settlers from Bull's estate.  When the party of settlers arrived, they found Yagan dead and Heegan dying. Heegan "was groaning and his brains were partly out when the party came, and whether humanity or brutality, a man put a gun to his head and blew it to pieces." The settlers cut Yagan's head from his body, and skinned his back to obtain his tribal markings as a trophy. They buried the bodies a short distance away.  James Keates claimed the reward, but his conduct was widely criticised. The Perth Gazette referred to Yagan's killing as "a wild and treacherous act ... it is revolting to hear this lauded as a meritorious deed." However, Daisy Bates understood that "he was killed in self-defence by the young lad." Keates left the colony the following month; it is possible that he left from fear of being murdered in tribal retaliation.
Question: when did he die?. Whats the answer?
When the party of settlers arrived, they found Yagan dead and Heegan dying.