Salt Lake City ? Gordon B. Hinckley, the Mormon church’s oldest president who presided over a period of great expansion, died Sunday. He was 97.

Hinckley, the 15th president of The Church of Jesus Christ of Latter-day Saints, died of complications arising from old age, church spokesman Mike Otterson said.

“His life was a true testament of service, and he had an abiding love for others,” said U.S. Sen. Orrin Hatch, a Utah Republican and fellow Mormon. “His wit, wisdom, and exemplary leadership will be missed by not only members of our faith, but by people of all faiths throughout the world.”

Hinckley had been diagnosed with diabetes and was hospitalized in January 2006 for the removal of a cancerous growth in his large intestine. In April 2006, he told a church conference he was in the “sunset of my life” and “totally in the hands of the Lord.”

By unfailing tradition, at a church president’s death, the church’s most senior apostle is ordained within days on a unanimous vote of the Council of the Twelve Apostles. The most long-serving apostle now is Thomas S. Monson, 80.

The church presidency is a lifetime position. Before Hinckley, the oldest church president was David O. McKay who was 96 when he died in 1970.

Hinckley, a grandson of Mormon pioneers, was president for nearly 13 years. He took over as president and prophet on March 12, 1995, and oversaw one of the greatest periods of expansion in church history. The number of temples worldwide more than doubled, from 49 to more than 120, and church membership grew from about 9 million to about 13 million.

Hinckley began his leadership role in 1995 by holding a rare news conference, citing growth and spreading the Mormon message as the church’s main challenge heading into the 21st century.

Over the years, Hinckley labored long to burnish the faith’s image as a world religion far removed from its peculiar and polygamous roots. Still, during his tenure the Roman Catholic Church, Southern Baptist Convention and United Methodist Church – the three largest U.S. denominations – each declared that Mormon doctrines depart from mainstream Christianity.

“We are not a weird people,” Hinckley told Mike Wallace on “60 Minutes” in 1996.

“The more people come to know us, the better they will understand us,” Hinckley said in an interview with The Associated Press in late 2005.

“We’re a little different. We don’t smoke. We don’t drink. We do things in a little different way. That’s not dishonorable. I believe that’s to our credit.”