Tight end Eric Saubert made the decisive two-point conversion for Seattle.
Seattle engineered a stunning fightback to overcome the Los Angeles Rams in extra time, clinching their place in the postseason.
Overcoming a 30-14 deficit in the fourth quarter, the Seahawks emerged victorious 38-37 at home, registering their fifth straight win.
While the Los Angeles had become the first to earn a playoff spot earlier on game day, the Seattle team secured their place to the postseason after a two-year absence.
With this result, the Seattle have taken over their division's race with a twelve and three record, supplanting the Los Angeles, who fell to the fifth playoff position with an eleven and four record.
Quarterback Sam Darnold had two interceptions but regrouped to deliver two scoring throws, culminating in the tying score to star receiver Smith-Njigba in the extra period.
The Rams held a six-point advantage at half-time before Walker burst through for a 55-yard touchdown run for the home side.
Los Angeles defensive back Wallace then took back Darnold's initial interception for 56 yards, leading to a short score by Blake Corum on the ensuing snap.
In the fourth quarter, a touchdown from Stafford to Puka Nacua extended the Rams' lead to 30-14, but Shaheed ignited the comeback with a 58-yard return for a score.
Darnold then found AJ Barner in the endzone, and a successful conversion forced the contest into overtime.
Although Nacua raced in for his another touchdown in overtime, Jaxon Smith-Njigba responded in kind to setup the decisive score.
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