As of November 23, 2015 the last fatal tornado in the US killed one person near Cameron, Texas on May 25. It was rated EF2.
The last known killer tornado, as of October 15, 2012 was an F2 in Wycinki, Poland that killed person.
In 2011 tornadoes killed 570 people, 553 in the U.S.
Most tornadoes, even in Oklahoma, do not kill. Those that do kill usually do not kill more than 1 or 2 people. However, a handful of tornadoes in Oklahoma have had death tolls in the dozens. The deadliest tornado in Oklahoma history, the Glazier-Higgins-Woodward tornado killed 113 people in Oklahoma and another 68 in Texas.
As of August 24, 2013 the most recent tornado in the United States, which ocurred on August 18, did not result in any deaths. This is not surprising, as 98% of tornadoes in the US are not killers. The last killer tornado in the US was an EF1 in Iowa on June 24, which killed 1 person.
It varies. Since official records began in 1950, tornadoes in Nebraska have killed a total of 54 people. Among these, individual tornadoes have had death tolls ranging from 1 to 11. The last killer tornado hit Nebraska was on May 22, 2004.
No such tornado has ocurred. The deadliest tornado in the history of the United States killed 695 people on March 18, 1925. The deadliest tornado in world history had a death toll of about 1300. It ocurred in Bangladesh on April 26, 1989.
As of October 19, 2011 the last serious tornado was an F3 in Goderich, Ontario, Canada on August 21 of the same year that killed 1 person.
Without a doubt the worst tornado of the past 10 years was the Joplin, Missouri EF5 tornado of May 22, 2011. This tornado killed 158 people, making it the 7th deadliest in U.S. history and the deadliest U.S. tornado since 1947. In addition, over 1,100 people were injured and damage total reached $2.8 billion, making it the costliest tornado in U.S. history.
The last F5 or EF5 tornado to hit the United States was on May 20, 2013 in Moore, Oklahoma. The last U.S. tornado to be rated F5 on the original Fujita scale (though EF5 is essentially the same rating) was the Bridgecreek-Moore, Oklahoma tornado of May 3, 1999.
Nobody in Texas was killed in any tornadoes in 2011. As of September of 2012 the last tornado related death in Texas was in 2007.
In the five year period of 2007-2011 tornadoes killed 826 people in the U.S. It should be noted that 552 of those deaths were in 2011, which is now tied with 1936 as the second deadliest tornado year in U.S. history..
The deadliest tornado in this tornado season (2011) hit Joplin, Missouri on May 22, killing 158 people. The last deadly tornado this year hit Springfield, Massachusetts on June 1, killing 3.