This is a developing story that will be updated.
Updated 1:43 p.m. with information from the Associated Press.
Updated 3 p.m. with video from Rams website.
Former Rams head coach Steve Spagnuolo, and general manager Billy Devaney, were fired from their posts with the organization the day after the Rams finished their 2011 season earlier this month.
An Associated Press source has also confirmed the hire. The St. Louis Rams have yet to release an official statement, but posted an NFL Network video on their website discussing the hiring.
A person familiar with the decision says Jeff Fisher has accepted an offer to coach the St. Louis Rams.
The person confirmed the agreement to The Associated Press on Friday on condition of anonymity because the hiring hadn't been announced.
Fisher chose the Rams over the Miami Dolphins, who had also courted him. The decision came after several days of deliberation by Fisher, who interviewed with both teams last week.
Fisher was widely considered the top prize in this winter's coaching-search sweepstakes. He led the Titans franchise for 17 years and helped Tennessee come within a yard of winning the 2000 Super Bowl. He stepped down a year ago as the league's longest-tenured coach, saying he needed a break, and sat out the 2011 season.