There are several theories about what happened to him, but none have been conclusively proven. It's possible he was killed by his own men, died of illness, or perished in a shipwreck.
Despite the uncertainty, several locations have been claimed as his final resting place. These include:
* Texas: Many believe he was killed by his men near the mouth of the Colorado River in Texas.
* Louisiana: Others believe he died in Louisiana, near the Mississippi River.
* Illinois: Some claim he was buried near Starved Rock in Illinois.
However, none of these claims are supported by concrete evidence. The mystery of his disappearance and burial location continues to fascinate historians and explorers.