Collin Welp added 15 points for UC Irvine, which has won six in a row against Hawaii.
Welp made two free throws to give UCI (17-10, 9-2 Big West Conference) a 13-point lead with 2:26 to play but Drew Buggs and Justin Webster answered with back-to-back 3-pointers to spark a 10-0 run that made it 66-63 when Zigmars Raimo made a layup with 36 seconds left but Leonard and Worku each made a pair of foul shots to cap the scoring.
Buggs led Hawaii (14-10, 5-5) with 17 points and seven assists and Eddie Stansberry scored 10 points.
The Rainbow Warriors have lost their last four games.
Kobe Bryant, Tim Duncan, Kevin Garnett lead star-studded Basketball Hall of Fame class
Kobe Bryant, Tim Duncan, Kevin Garnett, Tamika Catchings, Kim Mulkey, Barbara Stevens, Eddie Sutton, Rudy Tomjanovich and Patrick Baumann have been elected to the Naismith Memorial Basketball Hall of Fame.
On this date: NC State wins title on Charles' last-second slam
On April 4, 1983, North Carolina State and coach Jim Valvano upset Houston to capture the national championship on Lorenzo Charles' last-second dunk.
Source: Former Oklahoma State coach Eddie Sutton voted into Hall of Fame
Eddie Sutton, one of 10 Division I basketball coaches with 800 or more career wins, will be announced as part of the Class of 2020 for the Naismith Memorial Basketball Hall of Fame, a source told ESPN.