Yes, as Mark said he died after the war, and presumably not from “causes” of the war. Here’s a memorial to him from Find a Grave
Mrs. Mathieson, wife of Chief Justice Mathieson has received a telegram from her brother, Mr. D. R. Laird, stating that his youngest son Sydney had died very suddenly in Boston, where he had been under treatment in a hospital. The deceased was only twenty-three years of age.
After a course in the Latin School at Amherst he entered Harvard University and was a student there when the war broke out. He enlisted in the Nova Scotia Highlanders and fought with that regiment for three years. When the war was over he re-entered Harvard and resumed his arts course.
Mr. Laird spent last summer in Charlottetown. He was a young man of splendid intellectual and physical attainments, and excelled in athletic sports. He was very popular with his associates and the news of his death will be learned with deep regret by all who knew him.