OKC Thunder Co-Owner -- No Evidence Car Crash Was Suicide ... Cops Say

Cops say they can't find a shred of evidence that proves OKC Thunder co-owner was trying to kill himself when he slammed his SUV into a concrete bridge back in March ... despite a 2 month investigation.

Aubrey McClendon had been charged with conspiracy hours before the crash for his alleged role in an illegal energy scheme ... and many people thought he took his own life out of shame.

But the Oklahoma City Police Dept. says a team of detectives and accident experts looked into the crash ... and spoke with a bunch of McClendon's friends and say there's nothing that points to suicide.

Now, cops also say they can't be 100% certain ... but at this point, they're convinced he didn't crash on purpose.

The coroner determined McClendon died from blunt force trauma -- but his body was so badly burned in the fire that ensued, they needed to bring in a dentist to identify his body.