Lieutenant Colonel Mamuro is the previous leader of Unit 501 and the mentor of Motoko Kusanagi. He was killed in an apparent mugging amidst accusations that he had been involved in arms dealing and had accepted bribes.

The first movie of Ghost in the Shell: Arise. 

The anime's story is set in 2027, one year after the end of the fourth non-nuclear war. New Port City is still reeling from the war's aftermath when it suffers a bombing caused by a self-propelled mine. Then, a military member implicated in arms-dealing bribes is gunned down. 
During the investigation, Public Security Section's Daisuke Aramaki encounters Motoko Kusanagi, the cyborg wizard-level hacker assigned to the military's 501st Secret Unit. Batou, a man with the "eye that does not sleep," suspects that Kusanagi is the one behind the bombing. The Niihama Prefectural Police detective Togusa is pursuing his own dual cases of the shooting death and a prostitute's murder. Motoko herself is being watched by the 501st Secret Unit's head Kurutsu and cyborg agents.
 
(Source: Anime News Network)

Ricardo Fábio is a Brazilian actor, singer, director and voice actor. He is known for singing the brazilian theme of Dragon Ball GT