Salt Lake Tabernacle in 1870 are said to have resolved the outstanding acoustical issues with that structure. In 1851, Angell polygamously married Susan Eliza Savage, who had been a textile worker in the Lowell, Massachusetts, cotton mills in the early 1840s until she migrated to Salt Lake City after joining the Church. In 1855 he married a third time to Mary Ann Johnson. Angell was originally asked to also be in charge of the design and construction of the Manti and Logan Temples, but in consequence of their being about 100 miles distant from him in different directions, they were placed in the care of his two assistants. Truman O. Angell, Jr., supervised the construction of the Logan Temple and William H. Folsom was responsible for the Manti Temple, while Angell stayed and worked on the Salt Lake Temple. After his son completed the Logan Temple, he assisted his father with work on the Salt Lake Temple. In April 1856, Young asked Angell to leave his family and go to Europe so that he could learn the architectural designs there. After he returned from his mission to Europe, Angell continued to labor on the Salt Lake Temple. From 1861 to 1867, Angell had stepped down as Church Architect due to poor health and was replaced by William Folsom. However, in April 1867, Angell was again sustained by church members as church architect. Even during the time that he was not church architect, Angell worked closely with the construction of the Salt Lake Temple. He continued to serve as Church Architect until his death on October 16, 1887, at the age of 77. For more than 35 years he had worked on the Salt Lake Temple. It was said that he knew every stone in its walls. Of Angell, Wendell Ashton wrote: "As long as the Salt Lake Temple stands, there will be a magnificent monument to the patience, skill and dedication of its architect." Although Angell did not live to see the temple completed, he was a key mover behind its being built. Angell was buried in Salt Lake City Cemetery. A number of Angell's works are listed on the National Register of Historic Places. List of works Works include (with variations in attribution): Bear Lake County Courthouse, U.S. 89, Paris, Idaho (Angell, T.O.), NRHP-listed Beehive House, 67 E. South Temple St., Salt Lake City, Utah (Angell, Truman O.), NRHP-listed