WASHINGTON, D.C. — Cardinal Daniel N. DiNardo of Galveston-Houston, president of the U.S. Conference of Catholic Bishops, mourned the death of Thomas S. Monson, president of the Church of Jesus Christ of Latter-day Saints. Monson, 90, died Jan. 2.

“During his tenure as president, understanding and friendship developed between our two communities on national and local levels,” DiNardo said in a statement issued Jan. 3.

“As we engage important questions on family and the dignity of the human person, Catholics and Mormons work together and support each other. Today, Catholics join their Latter-day Saints brothers and sisters in commending his soul to the mercy and love of God,” the cardinal said.

Monson was the 16th president of the Mormons, whose church was established in the early 19th century.

He served in the Naval Reserve, reaching the rank of ensign. He saw no action in World War II and rejected a commission just before the outbreak of the Korean War to serve as counselor to his local Mormon bishopric. He himself became a bishop, akin to a Catholic parish pastor, at age 22.

Monson taught briefly at the University of Utah, then worked in the advertising department of the Deseret News, based in Salt Lake City, and the Deseret News Press, the Mormons’ publishing arm.

In 1959, at age 31, Monson became president of the church’s Canadian mission serving the provinces of Ontario and Quebec, working there until 1962. In 1963, he joined the church’s Quorum of the 12 Apostles — the youngest man in 53 years to serve in the post and 17 years younger than the next-youngest member, Gordon Hinckley, whom Monson succeeded as Mormon president in 2008.

Monson is credited with opening the church’s archives to researchers and scholars, even at the risk of documents being uncovered that contradicted Mormon teaching and practices, and with cultivating more missionaries within the church and opening the door for more and younger women to serve as missionaries.

However, he drew the line at ordaining women to the Mormon clergy and fought against same-sex marriage. In 2015, the church declared any Mormons in such a union to be apostates, which caused an estimated 1,500 Mormons to resign from the church. He also wrote to Mormon churches in California in 2008 urging them to support Proposition 8, which would eliminate the right of same-sex couples to marry in the state. The measure passed but ultimately was rejected by the courts.