Receiver Eric Saubert executed the game-winning two-point conversion for the Seahawks.
Seattle engineered a remarkable fightback to overcome the Los Angeles Rams in extra time, clinching their place in the NFL play-offs.
Rallying from a sixteen-point deficit in the fourth quarter, the Seattle squad triumphed by a single point at home, registering their fifth consecutive win.
While the Rams had already secured a playoff spot earlier on game day, the Seahawks secured their place to the play-offs after a 24-month absence.
With this outcome, the Seattle now lead their Conference race with a 12-3 mark, supplanting the Rams, who fell to the fifth playoff position with an eleven and four standing.
Quarterback Sam Darnold had two interceptions but regrouped to make two touchdown passes, culminating in the tying score to star receiver Smith-Njigba in the extra period.
The Rams held a six-point lead at the break before Walker burst through for a 55-yard touchdown run for the home side.
Los Angeles cornerback Wallace then returned Darnold's first pick for 56 yards, setting up a short touchdown by Blake Corum on the ensuing snap.
In the final stanza, a scoring pass from Stafford to Puka Nacua extended the advantage to 30-14, but Shaheed ignited Seattle's hope with a spectacular return for a score.
Darnold then connected with AJ Barner in the end zone, and a converted conversion forced the game into an extra period.
Although Nacua raced in for his another TD in OT, Smith-Njigba responded in kind to set up the decisive score.
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