Spicer started 52 games over the past four seasons for the Jaguars, who cut him before the start of free agency.
His best seasons were in 2005 and 2007 when he had 7½ sacks. During his 10-year Jaguars career, Spicer had 28½ sacks.
Spicer, 33, joins Rob Meier as former Jaguars trying to spice up the Saints defense. Meier started 15 games last season for New Orleans.
John Clayton is a senior NFL writer for ESPN.com