Yonegoro Nusumi

Yonegoro Nusumi is a victim Light kills in front of Raye Penber to prove to that he is really Kira. He only appeared for a few seconds he could be the most shortest character in the death note anime.

Cause of Death
At 3:00 PM on December 27, 2003, while wearing a hood to obscure his identity, Light holds Penber hostage in an underground section of the Shinjuku Station by killing Yonegoro Nusumi, an employee at a shop labeled "Cafeel" with a heart attack.

Nusumi had raped women but escaped a court conviction due to a lack of evidence, therefore Light feels justified in killing him. He is never seen or mentioned again.

Trivia
It is unknown wether or not Nusumi was actually a criminal Light may have mistakenly killed him. Also he may have killed him knowing he was a criminal but he did not commit rape. If he was a criminal the police were after him so he went under cover as a shinijuku coffeshop man. Or light may have just killed him and lied about him being a criminal though none of these have been confirmed.