Prior to joining the Vikings last season, Singletary spent three seasons as head coach of the San Francisco 49ers. He was fired late in 2010 and replaced by Jim Harbaugh, who's led the Niners to the NFC Championship Game and the Super Bowl in back-to-back years.
Singletary was a Hall of Fame linebacker with the Bears, but has never been a defensive coordinator in the NFL. His Q rating took a hit during the end of his run in San Francisco, but catching on with the Rams would certainly send his career back in the right direction.
Follow Dan Hanzus on Twitter @DanHanzus.