Iona lost control of the ball on its final possession, but regained it from the scramble to set up the wide open 3 for English.
The Gaels (14-8, 11-2 Metro Atlantic) trailed 86-74 with 4 minutes left before using a 16-3 rally to avoid the upset and move alone into first place in the MAAC.
Wesley Myers extended the Niagara lead to 89-82 on a three-point play with 2:02 to go before Iona scored the last eight points.
Ramone Snowden had 18 points and 10 rebounds, and Wesley Myers added 16 points. The Purple Eagles (6-18, 3-10) had 21 offensive boards and outrebounded Iona 48-29 overall.
Villanova guard Donte DiVincenzo will declare for the NBA draft but won't hire an agent.
Kevin Ollie is accusing UConn of violating his constitutional rights by firing him for cause, thereby avoiding the eight-figure payout that a termination without cause would have demanded.
Former Louisville recruit Brian Bowen will declare for the NBA draft in case the NCAA does not allow him to play at South Carolina.