The Riders are 0-3 after losing their second straight game in overtime.
The green-and-white went into the 4th quarter with a 15-12 lead and they extended that to 10 points early in the 4th on a 1 yard run by Brett Smith.
However, for the third straight game, the team could not finish their opponents off and after a decision to gamble on 3rd and 1 in the final minute on their own side of the field failed, it allowed B.C to tie the game on a 55 yard Ronnie Leone field goal.
Instead of running some plays with 20 seconds left to try and get into Paul McCallum's field goal range, the Riders decided to take a knee and go to overtime.
The Riders got the ball to start overtime and had to settle on a McCallum field goal and that led to BC getting the ball and scoring a touchdown as Travis Lulay hit Emmanuel Arceneaux with a 4 yard pass to win it for the Lions who are now 1-1.
The two teams will meet again Friday night at Mosaic Stadium in an 8 o'clock start.