Gregg Popovich will not coach in tonight's Game 3, the Spurs announced on Thursday morning.
Popovich's wife, Erin, passed away on Wednesday.
"We're all suffering a profound loss to a really important member of our family and our team," Spurs GM R.C. Buford said in a statement. "Erin and Gregg were best friends who were together for 40 years, and Erin's impact and influence on our organization, on our families, on our players and their families will be felt for years to come.
"I spoke to Pop this morning. He's overwhelmed by the support. He's very appreciative of the love that's been shared with our group and with him and his family and Erin's family. As you'd expect from Pop, he wants our focus to be about the game today, about this series, and that's what today will be about. We'll miss Erin a lot, and the focus of our team will be on supporting Pop. But we've got basketball to get back to."
San Antonio assistant Ettore Messina will coach in Popovich's asbsence.
Game 4 is on Sunday afternoon in San Antonio.