Wikipedia Biographical Summary

"...William Smith (also found as William B. Smith) (March 13, 1811 – November 13, 1893) was a leader in the Latter Day Saint movement and one of the original members of the Quorum of the Twelve Apostles. Smith was the eighth child of Joseph Smith, Sr. and Lucy Mack Smith and was a younger brother of Joseph Smith, Jr., the founder of the Latter Day Saint movement..."

"...On October 6, 1845, over a year after the assassinations of his brothers Joseph and Hyrum, Smith was disfellowshipped from the church and removed from the Quorum of the Twelve by Brigham Young, the President of the Quorum of the Twelve Apostles.

As a result, Smith did not follow Young and the majority of Latter Day Saints who settled in Utah Territory and established The Church of Jesus Christ of Latter-day Saints (LDS Church). Rather, Smith followed the leadership of James J. Strang and was involved with the Church of Jesus Christ of Latter Day Saints (Strangite)...."

"...Smith served a term in the Illinois General Assembly in 1842, being elected to the Illinois House of Representatives..."

"...When Smith died at Osterdock, Clayton County, Iowa, he was the last brother of Joseph Smith, Jr. to die. He was survived by his sisters Sophronia and Catherine..."

SOURCE: http://en.wikipedia.org/wiki/William_Smith_%28Mormonism%29