Knight was fouled going for a last-second shot after LMU's Keli Leaupepe tied the game with 23 seconds to go.
The Lions forced the overtime, after blowing a 17-point second-half lead, when Eli Scott scored with two seconds remaining, tying the game at 76.
Alex Barcello had 12 points for BYU (18-8, 6-5 West Coast Conference), which snapped its four-game losing streak.
Loyola Marymount scored 45 points in the first half, a season high for the team.
Leaupepe scored a career-high 26 points and had seven rebounds for the Lions (9-13, 2-8), whose losing streak stretched to six games. Scott added 16 points. Cam Shelton had 14 points.
- Michael Irving
- Larry Spaulding
- Scott Brown