Kell finished with 8-of-17 shooting from the field for the Aztecs (11-6, 4-0 Mountain West). Jeremy Hemsley and Malik Pope added 14 points apiece. The Aztecs averaged 43.9 percent shooting from the field and 86.7 percent from the line.
After trailing 31-29 at the break, San Diego State took a 46-41 lead on a 3-pointer by Pope with 10:46 to go in the second half. Colorado State's Joe De Ciman hit a 3-pointer to tie it 59-59 with 1:41 remaining but a layup by Kell put the Aztecs on top for good, 64-62, with 47 seconds to play.
Tiel Daniels scored 15 points and grabbed six rebounds for the Rams (10-7, 2-2).