Receiver Eric Saubert made the decisive two-point play for Seattle.
The Seattle Seahawks engineered a stunning fightback to defeat the Rams in overtime, securing their spot in the NFL play-offs.
Rallying from a sixteen-point hole in the final period, the Seahawks emerged victorious by a single point at home, registering their fifth consecutive victory.
While the Los Angeles had become the first to earn a playoff spot earlier on Sunday, the Seahawks booked their return to the postseason after a 24-month hiatus.
With this outcome, the Seahawks have taken over their division's race with a twelve and three mark, supplanting the Rams, who dropped to the number five playoff position with an 11-4 standing.
Signal-caller Darnold had two interceptions but recovered to deliver two scoring throws, culminating in the tying TD to wideout Smith-Njigba in the extra period.
The visitors held a 13-7 lead at half-time before Walker burst through for a 55-yard touchdown run for the home side.
Rams defensive back Wallace then returned Darnold's initial pick for a big return, setting up a short touchdown by Corum on the ensuing snap.
In the final stanza, a touchdown from Stafford to Puka Nacua extended the Rams' lead to sixteen points, but Rashid Shaheed ignited the comeback with a 58-yard punt return.
Darnold then found Barner in the end zone, and a successful conversion forced the contest into an extra period.
Although Nacua raced in for his second TD in OT, Jaxon Smith-Njigba responded in kind to setup the decisive conversion.