There was a theory that John Cabot met his death by the Spanish in1499.Is this true?

Answer 1

According to the first website mentioned below he disappeared at sea on his second voyage in 1498.

Another website, however, mentions a possible return to England as a pension continued to be paid until 1499.

Hope this helps.

Answer 2

In May 1498 Cabot sailed from Bristol again in command of five ships, and here knowledge of him virtually ends. Several of the vessels returned but the one in which Cabot traveled did not; those returning seemed not to know where or when Cabot's ship had been lost. Spanish evidence suggests that one English ship did reach the Caribbean, bearing out the fact that the intention had been to follow the American continent southward.