Tight end Eric Saubert executed the game-winning two-point conversion for Seattle.
The Seattle Seahawks engineered a stunning fightback to defeat the Rams in overtime, clinching their place in the NFL play-offs.
Overcoming a 30-14 hole in the fourth quarter, the Seattle squad triumphed 38-37 at home, registering their fifth straight victory.
While the Rams had already secured a post-season spot earlier on Sunday, the Seahawks secured their place to the play-offs after a 24-month absence.
With this outcome, the Seahawks now lead their division's standings with a 12-3 mark, supplanting the Los Angeles, who dropped to the fifth seed with an eleven and four standing.
Quarterback Sam Darnold had two picks but recovered to deliver two touchdown passes, culminating in the second TD to star receiver Smith-Njigba in the extra period.
The Rams held a 13-7 lead at half-time before Walker broke free for a 55-yard scoring dash for Seattle.
Rams cornerback Wallace then took back Darnold's first pick for 56 yards, setting up a one-yard score by Blake Corum on the ensuing snap.
In the fourth quarter, a scoring pass from Matthew Stafford to Puka Nacua extended the Rams' lead to 30-14, but Rashid Shaheed ignited the comeback with a spectacular return for a score.
Darnold then connected with Barner in the end zone, and a successful two-point play sent the contest into an extra period.
Although Nacua scored for his second touchdown in overtime, Jaxon Smith-Njigba answered in kind to setup the game-winning score.