See Info on page 1.
Apr. 2, 1880-Las Vegas New Mexico Dave Rudabaugh

Apr. 5, 1869-Johnson County Texas Benjamin Bickerstaff

Apr. 5, 1879-Dodge City Kansas Frank Loving

Apr. 5, 1889-Oklahoma Richard West "Little Dick"

Apr. 9. 1892-Bufflo Wyoming Frank M. Caton "Joe Horner"

Apr. 12, 1888-Oklahoma John Billee, Thomas Willis

Apr. 14, 1884-Elpaso Texas Buck Linn

Apr. 16, 1882-Trinidad Colorado Cockeyed Frank Loving

Apr, 19, 1889-Fort Smith Arkansas Malachi Allen

Apr. 19, 1919-Ada Oklahoma Joseph Allen, Jesse West, Jim Miller, Berry Burrell

Apr. 21, 1876-Fort Smith Arkansas William Leach

Apr. 25, 1889-Ventura California Jim McCarthy

Apr. 25, 1898-Ben Kilpatrick "Tall Texan"

Apr. 25, 1901-Clayton New Mexico Thomas Ketchum

Apr. 27, 1870-Helena Montana J.L. Compton, Joseph Wilson

Apr. 30, 1884-Medicine Lodge Henry Newton Brown

Apr. 30, 1889 Cache Bottom,Choctaw Nation George Tobler, Irvin Richmond

I would like to know more about Thomas willis of oklahoma

This is all I have.

1888- Oklahoma Territory- John Billee and Thomas Willis robbed and murdered W.P. Williams and buried his body in a ravine in the Kiamichi Mountains on this date. John Billee and Thomas Willis were later apprehended by three deputies, Will Ayers, James Wilkerson, and Perry DuVall. While en route back to Fort Smith for trial, the three lawmen and the two prisoners bedded down in a deserted cabin near Muskogee, Oklahoma. During the night, Billee managed to free one hand from the handcuffs which bound him to one of the deputies and reached for the deputy's gun. He shot Ayers, DuVall, and Wilkerson, wounding them, but Wilkerson managed to wound the outlaw before Billee made good his escape. All three wounded deputies, embarrassed at being jumped, were publicly denounced when they delivered their prisoners to Fort Smith. Billee and Willis were convicted of murder and sentenced to death. After several legal delays, they were both hanged at Fort Smith on Jan. 16, 1890.