John Middleton, 54, died yesterday night from an injection of pentobarbital, the sixth execution in Missouri this year. Only Florida and Texas, with seven each, have performed more executions.
Middleton was convicted of killing Randy "Happy" Hamilton and Stacey Hodge in early June 1995, then Alfred Pinegar several days later. He maintained to the end that someone else was responsible for the slayings.
"You are killing an innocent man," Middleton said in his final statement.
"Tonight has brought a conclusion to a case that illustrates how methamphetamine can have such a monstrous impact on so many lives," Nixon said in a statement.
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Michael Black, Pinegar's uncle, questioned why it took so long for the execution to occur.
"Nineteen years seems like a long time to wait for justice," he said following the execution.
Middleton was a small-time meth dealer in sparsely populated northern Missouri in the mid-1990s. After several drug suspects were arrested on June 10, 1995, he allegedly told a friend: "The snitches around here are going to start going down."
Prosecutors said Middleton shot and killed them both and hid the bodies in the trunk of Hamilton's car.
Pinegar, another meth dealer according to police, was shot in the face on June 23, 1995. His body was found in a field near Bethany.
Acquaintances say Middleton told them he killed all three. Police also had eyewitness accounts of Middleton purchasing ammunition in the hours before Pinegar's death. Middleton was convicted in 1997.
Middleton's girlfriend, Maggie Hodges, is serving life in prison after pleading guilty to second-degree murder in all three deaths.