Former Oakland Raiders defensive end Anthony Smith was just sentenced to 3 consecutive life sentences for killing 3 men between 1999 and 2001 ... TMZ Sports has learned. We previously reported ... Smith -- who played for the Raiders from '91 to '97 -- was found guilty of kidnapping two brothers -- Kevin and Ricky Nettles -- from a car wash in 1999 and then shooting them to death. Their bodies were dumped roughly 8 miles apart. In 2001, cops say Smith was part of a group that kidnapped Dennis Henderson and then stabbed him to death. - See more at:http://www.tmz.com/2016/01/22/anthony-smith-life-in-prison-murder-raiders/