He is also an amputee and requires the use of crutches after he lost his right leg to enemy gunfire while he was serving as a Marine platoon commander during the Vietnam War.

On March 16, 1967, Castille was conducting a search and destroy mission with his company in Đức Phổ, Quảng Ngãi province, when they came under attack from a Viet Cong battalion.

[6] Prior to his election to the Supreme Court, he was in private practice as a civil litigator for Reed Smith Shaw & McClay in Philadelphia.

[9] Journalists at The Philadelphia Inquirer revealed that Rotwitt was simultaneously acting as a business partner of the construction project's developer and was therefore involved on both sides of the transaction.

In 2012, Castille, a Republican, cast the deciding vote against the Pennsylvania Legislative Reapportionment Commission's redistricting map, siding with his Democratic colleagues.

[11] As district attorney, Castille frequently sought the death penalty, a point he used during his campaign for the Supreme Court.

Castille personally authorized seeking the death penalty against Terry Williams, who had killed two men who sexually abused him as a child, but the sentence was overturned 25 years later because the prosecution deliberately withheld key facts.