Receiver Eric Saubert made the decisive two-point play for the Seahawks.
Seattle staged a remarkable fightback to overcome the Rams in overtime, clinching their spot in the postseason.
Rallying from a sixteen-point deficit in the final period, the Seahawks emerged victorious 38-37 at home, notching their fifth straight victory.
While the Los Angeles had already secured a playoff berth earlier on Sunday, the Seattle team secured their place to the play-offs after a two-year hiatus.
With this outcome, the Seattle have taken over their Conference race with a twelve and three record, replacing the Rams, who dropped to the fifth seed with an eleven and four standing.
Signal-caller Sam Darnold threw two picks but recovered to make two scoring throws, culminating in the tying score to star receiver Jaxon Smith-Njigba in overtime.
The Rams held a 13-7 advantage at the break before Walker burst through for a 55-yard touchdown run for Seattle.
Rams cornerback Josh Wallace then returned Darnold's first pick for a big return, leading to a short touchdown by Blake Corum on the ensuing snap.
In the fourth quarter, a touchdown from Stafford to Puka Nacua pushed the advantage to 30-14, but Rashid Shaheed ignited the hope with a 58-yard return for a score.
Darnold then connected with AJ Barner in the end zone, and a successful conversion sent the game into an extra period.
Although Nacua raced in for his second TD in OT, Jaxon Smith-Njigba responded in kind to setup the decisive score.
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