Tight end Eric Saubert executed the decisive two-point play for the Seahawks.
Seattle engineered a remarkable fightback to overcome the Rams in overtime, clinching their place in the postseason.
Overcoming a 30-14 hole in the fourth quarter, the Seattle squad triumphed by a single point at home, registering their fifth straight win.
While the Los Angeles had become the first to earn a post-season spot earlier on game day, the Seahawks secured their place to the postseason after a two-year absence.
With this result, the Seattle now lead their Conference race with a 12-3 record, supplanting the Rams, who fell to the number five seed with an eleven and four record.
Signal-caller Darnold threw two interceptions but recovered to deliver two scoring throws, including the second TD to wideout Smith-Njigba in the extra period.
The visitors held a 13-7 lead at half-time before Walker broke free for a 55-yard touchdown run for Seattle.
Rams cornerback Josh Wallace then took back Darnold's initial pick for 56 yards, setting up a short touchdown by Blake Corum on the next play.
In the fourth quarter, a touchdown from Matthew Stafford to Nacua extended the Rams' lead to 30-14, but Shaheed ignited the hope with a spectacular punt return.
Darnold then found AJ Barner in the endzone, and a successful conversion sent the contest into overtime.
Although Nacua scored for his second TD in OT, Jaxon Smith-Njigba answered in kind to setup the decisive score.
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