Question: What is the date of death of Diana Hart's father?
Sentence (from "Stu Hart"): Hart was considered very handsome and a good in-ring performer, focusing on a submission-like and technical style of wrestling, but despite this and being popular in general he was not given a major spotlight by the writers, and soon after marrying Helen Smith, whom he met in New York City, he created his own promotion in Edmonton, Alberta which would be known as Stampede Wrestling and took over the surrounding wrestling territory which covered most of western Canada and the US state of Montana.
Relevant evidence: No