Following an LSU turnover, Houston (8-2) had a chance to tie it, but the 5-foot-11 Waters blocked Corey Davis Jr.'s 3-point attempt with six seconds to play.
Gray and Corey Davis Jr. scored 20 points apiece for Houston, whose winning streak ended at seven games.
Houston: The Cougars fell short in their bid to record their longest winning streak in 10 seasons.
Houston junior college transfer Corey Davis, whose hometown is Lafayette, Louisiana, nearly carried his team to a road victory.
- Aaron Epps, Tremont Waters lead LSU over Houston: Final score, stats and analysisNOLA.com
- Aaron Epps leads LSU past Houston 80-77Chron.com
- Tigers' thriller: Waters, Epps, Mays star as LSU hangs on for huge 80-77 win ...The Advocate
- Lou Williams, DeAndre Jordan lead Clippers over MagicLos Angeles Times
- LSU PG Tremont Waters on game-sealing block: 'I knew I had to make a big-time ...NOLA.com
- LSU basketball outlasts Houston, wins shootout 80-77SECcountry.com
- LSU beats Houston, 80-77, in thriller as Aaron Epps has career high 26 points ...The Daily Advertiser
- LSU lands 3 on Baseball America's top 100 college prospects for 2018 MLB DraftNOLA.com
- LSU gets ready to face a hot Houston team in the PMAC on WednesdayWAFB.com