To make room for Slaughter, Green Bay waived DT Terdell Sands.
Slaughter, 6-0, 233 pounds, was waived by the Jaguars Oct. 28. He played six games with three starts this season, tallying 19 tackles.
Selected out of Southern Miss in the third round of the 2000 draft, Slaughter has 42 career games, including 29 starts as a pro. He has started at both middle and weak-side linebacker and compiled 325 career tackles.
Slaughter, 26, had his best season in 2002. He started 11 games and finished with 106 tackles and two fumble recoveries. That campaign was the second 100-plus tackle season for Slaughter. His 108 takcles in 2000 made him one of only four Jaguars to have 100 or more tackles as a rookie.
Slaughter will wear No. 57 and join the Packers at practice today.
In other transactions, Green Bay released tight end Tony Donald from the practice squad.