Tight end Eric Saubert made the game-winning two-point conversion for Seattle.
The Seattle Seahawks engineered a stunning comeback to overcome the Rams in extra time, clinching their spot in the postseason.
Overcoming a sixteen-point hole in the fourth quarter, the Seahawks emerged victorious by a single point at home, registering their fifth consecutive victory.
While the Rams had become the first to earn a playoff spot earlier on Sunday, the Seattle team booked their return to the postseason after a 24-month hiatus.
With this outcome, the Seattle have taken over their division's race with a 12-3 mark, replacing the Los Angeles, who fell to the fifth playoff position with an 11-4 standing.
Quarterback Sam Darnold threw two interceptions but regrouped to deliver two scoring throws, including the second TD to wideout Jaxon Smith-Njigba in overtime.
The visitors held a 13-7 advantage at half-time before Walker burst through for a long scoring dash for Seattle.
Los Angeles defensive back Josh Wallace then returned Darnold's first pick for a big return, setting up a short score by Blake Corum on the next play.
In the final stanza, a touchdown from Stafford to Nacua extended the advantage to sixteen points, but Shaheed provided the hope with a spectacular return for a score.
Darnold then found AJ Barner in the endzone, and a successful conversion sent the contest into an extra period.
Although Puka Nacua scored for his another TD in OT, Smith-Njigba answered in kind to set up the game-winning score.