On Memorial Day 2005 in Oklahoma City, a mobile home gathering ended in a concentrated volley of gunfire that left four people dead. Amy Jeanne Wright, 26, was among those killed; she was shot in the back while trying to flee. The other victims were James Donnie Swindle Jr., 49; James D. Alderson Jr., 57; and Terry Smith, 56.

Investigators say the attack was a blitz-style assault by several men armed with assault rifles who fired nearly 100 rounds. The attack was reportedly motivated by a belief held by Earl Brad Postelle that Donnie Swindle had been responsible for a prior motorcycle crash that seriously injured him. That belief was later shown to be unfounded.

Authorities identified Gilbert Ray Postelle, then 19, as the primary shooter, accompanied by his brother David Bradford Postelle and Randal Wade Byus; their father Brad Postelle was described as the instigator. Gilbert Postelle was convicted on four counts of first-degree murder and received death sentences for the killings of Amy Wright and James Alderson, with life terms for the other two victims. David Postelle received life in prison; Byus testified against the others in exchange for a lesser sentence. Brad Postelle was found incompetent to stand trial and later died.