Crips Gang Co-Founder Executed in Calif.

SAN QUENTIN, Calif. -- Convicted killer Stanley Tookie Williams, the Crips gang co-founder whose case stirred a national debate about capital punishment versus the possibility of redemption, was executed Tuesday morning.

Williams, 51, died at 12:35 a.m. after receiving a lethal injection at San Quentin State Prison, officials said. Before the execution, he was "complacent, quiet and thoughtful," Corrections Department spokeswoman Terry Thornton said