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Oklahoma State Bureau of Investigation
Friday September 9th, 2016 :: 04:08 p.m. CDT

Advisory

Arrest Made in 2012 Moore Homicide

<p>In April 2012, a Moore man was found dead in his driveway at 1406 Sequoyah.&nbsp; In March 2016, the Moore Police Department requested OSBI conduct a full investigation.&nbsp; Today, one man is behind bars and another arrest is imminent.&nbsp;&nbsp;</p>

<p>William Cooksey, 44, was found lying in his driveway just behind the back driver-side tire of his pickup truck.&nbsp; Moore P.D. crime scene investigators collected two palm prints on the truck near the body.&nbsp; Recently, the Automated Fingerprint Identification System matched those palm prints to Jason Louis Lane Diamond.&nbsp; OSBI special agents located him and learned Diamond was roommates with Billyjack Luther Phillips (d.o.b. 12/26/1985) at the time of Cooksey&rsquo;s death.&nbsp; The victim was married to Phillips&rsquo; mother at the time of the murder. Diamond told special agents that Phillips asked Diamond to drive him from Dallas, Texas, to Moore to help collect his mother&rsquo;s belongings, saying his mother and stepfather were fighting.&nbsp; When Diamond and Phillips arrived at Cooksey&rsquo;s Moore home several hours later, Phillips and Cooksey initiated a physical confrontation.&nbsp; During the fight, Diamond got involved and struck Cooksey several times.&nbsp; Cooksey eventually fell to the ground.&nbsp; Phillips stomped and kicked Cooksey before Phillips and Diamond left the area.&nbsp; According to the medical examiner, Cooksey died from blunt force injuries in conjunction with possible asphyxia due to an assault.</p>

<p>Thursday, OSBI special agents assisted Texas Rangers in arresting Phillips at his Dallas apartment for first degree manslaughter.&nbsp; He was booked into the Collin County jail, where he remains for the time.&nbsp;</p>

Address/Location
Oklahoma State Bureau of Investigation
6600 Harvey Ave
Oklahoma City, OK 73116

Contact
Emergency: 9-1-1
Non-emergencies: 405-879-2591

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