Receiver Eric Saubert made the decisive two-point conversion for Seattle.
The Seattle Seahawks engineered a stunning fightback to overcome the Rams in extra time, securing their spot in the postseason.
Rallying from a 30-14 deficit in the fourth quarter, the Seattle squad emerged victorious by a single point at home, notching their fifth straight win.
While the Los Angeles had become the first to earn a post-season spot earlier on Sunday, the Seattle team secured their place to the postseason after a 24-month absence.
With this outcome, the Seahawks have taken over their division's standings with a twelve and three record, supplanting the Rams, who fell to the number five seed with an 11-4 standing.
Signal-caller Sam Darnold had two interceptions but regrouped to deliver two scoring throws, including the second TD to star receiver Jaxon Smith-Njigba in overtime.
The Rams held a 13-7 lead at half-time before Walker burst through for a 55-yard scoring dash for Seattle.
Los Angeles cornerback Josh Wallace then returned Darnold's initial interception for a big return, setting up a short touchdown by Blake Corum on the ensuing snap.
In the fourth quarter, a scoring pass from Matthew Stafford to Nacua pushed the Rams' lead to sixteen points, but Rashid Shaheed provided Seattle's hope with a 58-yard return for a score.
Darnold then connected with Barner in the end zone, and a successful conversion forced the contest into an extra period.
Although Puka Nacua raced in for his another touchdown in OT, Jaxon Smith-Njigba responded in kind to setup the game-winning score.
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