On April 19, 1995, the Alfred P. Murrah Federal Building in Oklahoma City was bombed by Timothy McVeigh. 168 people were killed in the bombing. This was the worst terrorism attack in the United States before the World Trade Center attacks on September 11, 2001. McVeigh and his partner, Terry Nichols, were both convicted of the bombing. Some people think other people were involved. McVeigh was later sentenced to death and executed by lethal injection on June 11, 2001. His partner, Nichols, was convicted of 161 counts of first degree murder. Nichols is spending the rest of his life in prison without the chance of being released.