The cause behind a weekend collision that left an OHP Trooper and Missouri man dead is still under investigation, according to reports from the Oklahoma Highway Patrol.

Trooper William L. McClendon, 37, of Mounds, and Hussein Haji-Ege Osman, 25, of Kansas City, Mo. died in a collision Sunday afternoon, near mile marker 260 eastbound on the Will Rogers Turnpike in Rogers County.

The collision occurred shortly after 1 p.m. Sunday, Oct. 1, with Trooper McClendon driving his 2006 Dodge Charger OHP Unit and Osman driving a 2002 Peterbuilt semi tractor trailer.

Trooper McClendon was pronounced dead at the scene, having suffered massive internal injuries. Hussein was transported by Air Evac Life Team to St. John’s Hospital in Tulsa, where he was pronounced dead at 2:50 p.m. from massive internal injuries.

McClendon’s family told the Tulsa World he had been dispatched to an emergency call along the turnpike before the accident, but the call was canceled.

He was attempting to turn around through a concrete barrier opening when his car collided with the tractor-trailer, said Shirley McClendon, who is married to the trooper’s brother, Richard Dwayne McClendon.

McClendon was driving a Dodge Charger that was one of the first to be added to the Oklahoma Highway Patrol’s fleet. He may not have been familiar with a blind spot that can conceal obstacles at rear-looking angles, Shirley McClendon said.

Troopers across the state wore black ribbons on Monday in honor of McClendon, and calls of support came from law enforcement agencies in other states, said Lt. Pete Norwood.

McClendon loved being a trooper and understood its risks, family members said.

“I always told him he should never drive faster than his angel could fly. But he always said that if he was going to go, he wanted to go in his car,” Shirley McClendon said.

It could take a couple of days for investigators to reconstruct the accident scene and release a probable cause, OHP spokeswoman Kera Philippi said. The agency has sought the help of motorists who may have witnessed the crash.

Philippi declined to comment whether McClendon was trying to turn around before the crash.

There is a gap in the retention wall dividing the eastbound and westbound lanes — one of many designed to be used by emergency vehicles to turn around — at the accident site.

Osman, 25, of Kansas City, Mo., died of massive internal injuries after being ejected roughly six feet from the tractor-trailer, an OHP report states. He died at a Tulsa hospital.

Trooper McClendon, 37, was an eight-year veteran of the OHP. The Mounds resident also was an assistant manager at the Broken Arrow branch of Moody’s Jewelry.

“He worked a lot,” Shirley said of her brother-in-law. He wanted to make sure his family didn’t do without.”

Gov. Brad Henry ordered all flags on state property to be flown at half-staff on Thursday, the day of his funeral in Marietta. Services are scheduled for 10 a.m. at the Marietta school auditorium. Burial will follow at 4 p.m. at Green Hill Cemetery in Sapulpa.

McClendon is survived by his wife, Hope, and three children, Dakota, 17, Maverick, 13, and Kendra, 10.

Herby Heiney III, who sold gems alongside McClendon at the jewelry store, said the trooper told him that his job at the jewelry store was work and his OHP position was his passion.

“He was one of top salespeople in our store. A lot of people in their side jobs do them kind of halfheartedly,” Heiney said. “He did Moody’s with a passion and just like it was a part of him. He was very motivating.”

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