Marc Spears of Yahoo! Sports tweets the following:
Suns agreed to term on a 4year, $18 million deal with free agent F Hakim Warrick, sources tell Y! Looks like Amare era in Phx could be over
Marc J. Spears
SpearsNBAYahoo
According to Spears, this move likely foreshadows the eventual departure of Amar'e Stoudemire. His report says that Stoudemire was hesitant to commit to the Suns until he had sorted through all his options.
The Suns had made a last-ditch effort to sign Amar'e to a four- or five-year deal with the latter years only partially guaranteed and based on various incentives for minutes played, since they could not get the contract insured due to STAT's past injuries.
The team also apparently believed Stoudemire had a fully-guaranteed max deal on the table from the New York Knicks.
UPDATE:
Sports 620 KTAR's John Gambadoro clarifies some of the details of the Warrick contract:
Suns replacement for Amare -- Hakeem Warrick. 3 year deal for $12 million with team option for a fourth season
John Gambadoro
Gambo620