Tsarnaev was convicted of all 30 charges against him, including conspiracy and use of a weapon of mass destruction and the killing of Massachusetts Institute of Technology Police Officer Sean Collier during the getaway attempt. Prosecutors said the brothers carried out the attack to punish the U.S. for wars in Muslim countries.

Japanese death-row inmate Chisako Kakehi, dubbed the "Black Widow" after she used cyanide to kill her elderly lovers​, has died in a detention center at age 78, officials say,