Another example is William Kingdon Clifford, who also died too young, while having excellent chances of advancing mathematics.

James Clerk Maxwell died simultaneously with Clifford. Maxwell was not so young, but his death was also very premature.

Had not both Clifford and Maxwell died too soon, there would have been very good chances for the mathematical bases of the theory of physical quantities to be improved many decades earlier, possibly skipping over the incomplete vector theories of Gibbs and Heaviside, which while very useful in the short term for engineering, in the long term were an impediment in the development of physics.