FLORENCE, Ariz. — The State of Arizona executed Richard Djerf by lethal injection on Friday at Arizona State Prison Complex-Florence.

When asked if he had any last words, Djerf said he "did not."

Witnesses to the execution said the inmate officially died at about 10:40 a.m. after some time was spent struggling to find a vein on Djerf's arm to insert a needle.

The death penalty comes roughly 30 years after he admitted to killing four members of a Phoenix family.

Court records show Djerf committed the murders for retribution of a "petty theft" of Albert Luna Jr., whose parents and two siblings were killed on Sept. 14, 1993.

Djerf, in recent weeks, expressed remorse for the killings and accepted his fate.

In a letter obtained by The Arizona Republic, he wrote he brutally murdered fou

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