@kdtrey5 steps forward and gives $1mil matching gift to the ARC for disaster relief, text "REDCROSS" to 90999 for a $10 donation.
— Red Cross Oklahoma (@redcrossokc) May 21, 2013
Regional Red Cross: “Mr. Durant’s gift and support to Okla. comes at a time of great need and we’re forever thankful for his generosity.” — Royce Young (@dailythunder) May 21, 2013
It's also well-worth mentioning that Kevin Durant did not announce this donation. Rather, the Red Cross was the first to point out Durant's contribution (which was made through his personal charity arm, The Durant Family Foundation), with Kevin letting his donation do the talking.
There's isn't much to add beyond this. The devastation in Oklahoma was as stunning as it was swift, and any little bit helps. The Red Cross' localized branch is the best place to go if you want to contribute as Kevin did.